perosnally i find i "get into" my character better on new vegas, on oblivion something just keeps me from roleplaying, but on new vegas my first playthrough i was a merc who was 100% loyal to mr house, everyone else it was all about the money, the second (unfinished) im a merch.. all the money for me baby... on oblivion the best i can say is that 'im a stealth character" , and i havent played much morrowind yet..

Oblivion I find best, New Vegas and Fallout 3 I find hard to get into

I can roleplay in Morrowind really well, so long as it's "inside the box." If I'm not doing a specific in-game questline, then it's too hard for me to keep it going. In Oblivion, it's much easier, and much more possible for me to roleplay outside the box. I've had characters that don't do any in-game quests but that still do a lot. There's just way more roleplaying potential in Oblivion than in Morrowind.

As far as the Fallouts go, I only played FO3 once and I didn't like it all that much. I can roleplay really well in New Vegas though, and it's a lot of fun. My last character was in it for herself, but was playing everyone against each other, ultimately causing everyone else's campaign for Vegas to fall apart while she built up her own.

I can roleplay better in Oblivion (though I don't actually do it very often) than any other game. I just find it wuite easy to "get into" the world. I suppose that's mostly down to the graphics and voice acting.

I'm the opposite. It took me a very long time to get into roleplaying on Oblivion, having to completely change my approach to it (admittedly for the better) before I enjoyed it. In contrast, Morrowind roleplaying came very naturally to me. I can't wait to fire it up again. I feel there is more potential for interesting roleplays in Morrowind, but bear in mind I played on PC and used quite a few mods.

I've not played New Vegas. Played FO3 quite a lot actually, but I never really roleplayed until my last playthrough (which lasted about 10 hours before I last played FO3). I didn't find much to RP that was interesting. Got addicted to chems, reformed, then lived in Megaton for the rest of the game, adventuring.

I don't really role-play better in any particular game, but then again, I role-play quite a lot.

I've actually RP'd in Call of Duty, so... there you go.

Fallout 3 and Morrowind.

Depends what do you call roleplaying, because in TES i found it has no REAL rolepalying values at all, i dont accept that "virtual" LARP thingie definition as roleplaying (what an nice oxymoron i've made here)

I roleplay best in Oblivion, but Morrowind has some good stuff for specific characters.

I guess Daggerfall is actually the best, for me. It's bland, repetitive, and lacking in detail, but the huge world, the various advantages disadvantages, the many factions, and the cool role-playing features (ship-buying, house-buying, bank usage, etc.) make feeling as though I were a part of the world easier, for me.

Morrowind: It has many unique roleplay ideas that the other games don't offer.

Such as a Tribunalite making a pilgrimage or a Daedric Cultist traveling to the various shrines of his god.

Oblivion: It was easier to roleplay in this, but there were less unique ideas.

A knight or guard was a common one.

Fallout: New Vegas: The best to roleplay in (IMO), because the AI is good, the graphics are good and it has factions that matter heavily.

A former CL slave or an NCR soldier are very fun RP ideas.

In Morrowind, My character did all the different actions in the game, it interacted with different in-game traveling service managers, I looked at the available courses that would let me travel around the Tamriel. but in the end my character did all the job.

My character opened it's notes on the quests, as quest logs, and I read them to find out about clues to where to go next, and in the game, I walked around looking keenly to the scenery to find those clues in the landscape to help me decide where to go next.

In the next games, there was always a frigging GPS pointer on the screen compass nose leading me were I needed to go, to the exact location of the target of the quest, so all that I needed to do was to follow that marker on the compass, and voila, I reached the exact target of the quest that I needed to interact with at the next stage of the quest.

And if there was a place that I had visited earlier in the game, I, (not my character) could find it on the game map made for my convention, and click on it and my character would teleport to that location so that I could follow the compass carrot in shorter distance.

So I think I enjoyed and was more immersed in the game and role playing in Morrowind more than the later games.

Edit:
[SIDE NOTE]
In Morrowind, the little voice acting in the game were excellent and non-disruptive, and a lot of mod-added quests and LGNPC mod series merged right into the game without causing any disruptive difference, and any modder could with a bit of imagination actually add to the game experience.

Fallout games were well made, but they lacked the half-voiced integrity of Morrowind that allowed modder added content to blend right in easily, and one really serious reason for me for choosing BGS games as the best games around is the great mod-ability.
[/SIDE NOTE]

If the Fallouts Didnt make you wear the PipBoy 3000 I would Say Fallout NV Would be best for Roleplaying.(Its always fun to Roleplay as a Jet Junkie thats working for house to get his/her Next Fix. )

But Since it makes you wear them,I have to say Oblivion,Or Morrowind.

Yeah, this is true, due to the more dynamic nature of the world, where in Morrowind, the world is basically static.

RP like you don't have it. Or better! Be an ex-vault dweller who found a pipe and thought it was medicine (as if he's not too bright) and smoked it. Instantly getting an addiction. If you're really dedicated, RP as if Myron and the Chosen One had never discovered the cure for Jet!

Good Point...Very Good Point!Ok,Fallout NV Is Officaly best to Roleplay!:D Thank you Kalarn.

Pandora's box, you've opened now.

Why do you bring up Morrowind mods and at the same time ignore the Oblivion mods that did away with the quest marker and fast travel?

Because they could not complete the job and add complete comprehensive directions to the quest targets and let quest givers direct us to the targets instead of marking the target in the GPS.

They could not overhaul the Oblivion quests completely for the purpose which was needed to replace those GPS markers completely.

But if Oblivion was not completely voice acted, just like Morrowind, it would have been a much easier task, for the modders, but still a complete quest overhaul, none the less.

My opinion is exactly the opposite of this. I find that if I'm not doing quests in Oblivion my characters just tend to wander around aimlessly. Cyrodiil and its inhabitant have not yet stimulated my roleplaying. Eventually, after dungeon-diving for awhile, I lose interest in my "out-of-the-box" characters. By contrast, in Morrowind I lose interest when I try to play inside the box.

I can't put my finger on it, but there's something about Morrowind has always invigorated my creativity. I've found numerous little niches that I can fit an atypical character into. I've played a slave character; a character who was the niece of Caius Cosades (which came up with an explanation why Cosades was recalled to Cyrodiil); two sisters, one of whom went missing during the main quest and the other traveled to Vvardenfell to track her down; an ex-Dark Brotherhood assassin (which came up with an explanation why the attacks occurred right off the boat) etc, etc, but I just have never felt compelled to do the same thing in Oblivion. I haven't yet found mysterious bits of Oblivion's story that intrigue me enough to want to fill the story in with a character and an explanation of my own.

The closest I have come to doing it in Oblivion so far has been connected to a mod, actually. My last Oblivion character was the daughter of a gift shop clerk, an NPC added by Shezrie's Pell's Gate mod.

I don't play Fallout 3 so I can't comment on that game.

Def. Oblivion

Oblivion I had such a good time role playing in that game. I'd go off on tangents...Collect things, spoil my house (Loved the Fighter's Guild Strong Hold.).

Morrowind had its moments, but I could never really have people follow me.
For Example:
I had this girl at 100% disposition...
I'm the EFFIN NERAVINE...
I'm still being treated like ish when I steal something.

Oblivion, I'm just a nobody like the rest of the people who go on about their daily lives. They may have heard about me...but I'm treated like a normal person. They don't know of me helping Martin, Nobody does! Thats the Point of the Game! <---The Game makes you a Role that I love....You're Batman!
BEFORE YOU LAWL/or Say I'm a Troll; Think Batman Dark Knight. I have to be what the people need to me to be. I'm effin Doing all this crazy stuff, but I'll be the bad guy if it means getting the bad guy. I'll be the MOST respectful Knight in Shining Armor, but they can't know who I am or my enemies will attack them...so I do everything in Secret. So If I have to be a Bad guy, I'll be one, EVEN though I'm a good guy...It's Inception of your character..Your a Character, With in a Character, while playing a character. (Yo dawg I heard you like Role playing...so we put a Character in your Character so you can Role play while you Role play). It's intense on a nerdy scale.

Companions like Mazoga are built like a Tank, Infact, Only time she dies is when I'm with her and she gets over run by magic users. Which Never happens. (I had a storm of Demons from a Gate opening near her..Magic Demons tore her asunder..)

Much like Fall Out 3(Which I will get into), Companions = Totally worthless unless they are immortal or re-summonable. They die too quickly. Like Escort missions except..they rush head strong into battle and don't heal themselves.
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Fallout Series...svcked for Role Playing..I'm sorry but Dialogue Options was garbage in FO series (I have every achievement in FO3 on Xbox...I love the game very much and put ALOT of time into it). I could literally Tell some one to calm down...and what happens? They go nuts anyway. I could tel some one I'm here to help...still won't do me any good. I could be the baddest mofo on the planet...Raiders will still attack me...<----Factions in FO3 svcked. The Dialogue Options were: I could tell you differently, but I'm going to ignore you anyway or No Dialogue Options at all.

Now...FO New Vegas WOULD be Good...if the Faction/Desposition thing wasn't as messed up/buggy, specially with the "Clothing" ordeal. AND The Fact that most the people you like...can be killed so easily if they are not a companion. I love Red from the Underground Pit Fighting groups, but...she doesn't do much other then that. I love the Companion Ordeal in New Vegas, I wish I had it in Oblivion, Morrowind, Hell Fable series too...but it svcks because you don't really have any companionship with them... you do a Mission, you talk to them sometimes, but over all..they are a mindless pet/cannon fodder.

FO3 = Clover gets eaten with bullets and dies...The End. FO3 had my favorite type of companions, Slave Girl who enjoys being your slave/body guard. I'm sorry but I like taking care of my girls, specially slave women. I'm the complete opposite of Jabba The Hut..I make "Ex" Slave girls love me so much, they want to stick around anyway. So they are still a "Slave" but not to me.I know I'm effed up...but I like taking Clover from Bad girl to Good girl...The Slaughtering of her Former House was....down right poetic, but at the same time..it was...Pretty much: Put Clover at home...and deal with all the baddies...then talk to her when I get back, which only leads me to the same dialogue options. So there wasn't any Role playing going on...its she is a mindless drone who says the same things (Like the butler of your home!).

I wish the System of FO:NV was on FO3, I also wish NPC's didn't die so abruptly in FO series...I know it's part of the Grim/Grit...but I wish we had an option to turn it off..
I was playing FO3 so much...I fell in love with the Traveling Merchants...I beat the game/got to such a high level...and ALL...OF..MY...MERCHANTS...DIED.
Radscorps, Bad Guys...you name it...I was with out my Crazy Wolf Gang... He died out in the wilderness with out my knowledge, and I saved the game too far to even be able to go back to when he was alive because I don't know when it happened..<---That killed it for me on RP'ing in Fall Out.
Although I role played the crazy Vengeful Heavy Armored Psycho with a Mini Gun pretty well when I went around each town and destroyed each and every bad guy camp you could think of....<----but they all come back...and its just no-name npc's...so...it still doesn't do anything for me...and I'm still with out Wolf Gang.