1500+ hours? I got like 105 and I have done everything that one can do already..
If I had to rate the DLC's for both Fallout 3 and New Vegas this list would look something like this:
Point Lookout
Old World Blues
Mothership Zeta
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Operation Anchorage
Dead Money
Broken Steel
The Pitt
Honest Hearts
The top three were the ones I enjoyed playing the most. Point Lookout had an awesome atmosphere and new enemies, cool quests etc. And they removed a piece of your brain! The only downside was that they reused the same skin for almost every hillbilly enemy, I think they had like three different redneck skins in total. So one had to see them over and over again wherever one went. (But they were cool skins).
Old World Blues had by far the best dialogue in all the DLC's. Some enemies were cool, like the lobotomitz but the robo scorpions, robo hounds and robots in general quickly became a bit
meh. (Even though the DLC was all about sciene I think that it should have been a greater variety on the robo side. Maybe some new robots and not just Mr Handy and his crew of Fallout robots but now with different names.) And without spoiling too much, in Point Lookout they took out a piece of your brain, but compared to what they do to your body in Old World Blues the brainbit from Point Lookout seems harmless. :biggrin:
Mothership Zeta. I remember when it was about to come out. I watched and rewatched that trailer numerous times and I still got it bookmarked and watch it again now and then. Why? Because the sound and feel of the clip is (still) so awesome. Anyway, the DLC was also great and finding that UFO and then getting beamed up was really cool. And the ship and alies did not dissapoint either. But getting to the final room, the final 'boss' was a long and hard road. I played on Very Hard and did not bring a gun or armor along (Bad day to start rp'ing) so I got my butt handed to me several times. And it never ended! Once I got into one room there was another one, and another one, and another one after that one. So I ended up lowering the difficulty and running to the end after awhile just to get it over with. But the end was really nice and fighting that other shop was a nice touch. (Even though the boss went down with one shot to the back of his head..) Oh and the laser that one could control at one stage of the DLC! I fired away some shots that hit the earth, it would have been nice to get to see the devastation I caused. But a great DLC nontheless.
(It was also around the time of MZ that I created my account here, after having troubles installing it.

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These DLC's up next had some good parts, some bad parts and some of them I did not enjoy at all/as much as the rest.
Operation Anchorage was the first DLC of them all and the scenery was a much needed change. (Icywhitesnow vs. Greydesertdust) Most cool parts was scripted and the objectives one had to complete was not so appealing. But the reward in the end (together with the change of heart from the brotherhood) made this DLC quite rewarding even though it were a bit chore'y at times.
Dead Money was the first DLC I actually ragequit on at several occasions. I was bored out of my skull and ended up running through almost the entire DLC just to get it over with. The only nice part of it was the end, where one faced off with Elijah and tried to escape with as much gold as one could. (I know I did anyway

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Broken Steel had two cool things. One, it made it possible to keep playing after 'winning' the game. And the other was that giant robot that helped the player in the fight. Other then that it just felt like more of the same. No new environments and no new enemies. I ended up stealthboy'ing through the latter part of the DLC.
The Pitt glitched out for me so I fell through a floor and had to reload an much older save. But it was the lack of "cool things to take home to mama" afterwards together with the 'fun' collectibles that made this DLC feel a bit like a downer.
The dark, gritty construction sites with the yellowchainsaw thingy wearing enemies coming at you.. Sure it's fun for awhile, but the whole DLC were filled with them. Together with the Gollum creatures in the outskirts of the Pitt.
I can't even remember the plot besides something, something, baby.
Honest Hearts. Ah I had so high expectations on this one. The Burned man, the religious agendas, the tribes fighting it off. But my first playthrough was a mess. I shot a guy on a cliff at the start of DLC't (the one were the guy Follow Chalks attacks the guy on the cliff in a scripted fashion) but I managed to shoot both the guy I was aiming at and Follow Chalks! So he became hostile and I had to kill him. (I though at the time that he was just another tribesman but with a unique name). So the whole mainquestline was messed up and I failed quests here and there when I tried to talk to people. I ended up reloading an old save just so I could try the DLC from the start again. And this time it went better. But I ran through most of it and I did not care for the NPC's nor their cause.
In the end the DLC gave me much trouble, no cool loot to bring back to New Vegas and no gaming memories. Except the two skeletons I found that appearently were humping each other (one for cash) at a car when the world came down upon them. (Fallout war, yummy).
Anyway, that is my halfarsed/halfbaked quick review. Bash it or don't, agree of disagree. Either way come up with your own list and explanation and it's all good.