* Doors of the Lucky 38 disappearing, which in terms made me fall into the husk of the building. when moveto was used (i used player.moveto 116a52, which teleports you to Jane) and when exiting the building you end up in a place without anything basically and have to World travel to get out of it.
* Carbon Fibre mod for sniper rifle does not lower it's weight (the numbers say it did, but it still weighs 8)
* Achievements not triggering properly (on steam) i completed the game with hardcoe enabled and it didnt trigger, several others did not trigger, including and not limited to, ALL the level up achievements, and several quest/challenge achievements, i don't even know if the hardcoe reward triggered for me completing the game, but i was expecting a better reward or something, not just the ability to turn it on or off at leasure. the game wasnt that much harder with hardcoe mode on to begin with.
* Multiple accounts of bugged npc's resulting in looping dialogue options for "infinite Exp" old ben in freeside is one of them if the quest for the 3 patrons is allready done.
* Eyes of NPC's not in the right place, cheyenne is a good example she is the first npc i ran into that i saw had this bug, doesnt happen 100% of the time but IF it happens her eyes hang on the side of her Neck
* NPC (mainly Scorpions and Coyotes walk either with 1 side embedded into the earth or head/tail first
* NPC's floating instead of walking (hoker on the strip "danced" instead of walking
* NPC's getting stuck in the floor
* Dropped items getting stuck in the floor or being gone completely (most notable in the Brotherhood of Steel Safehouse)
* When killing the robots in the Sacrifice Chamber in Vault 11 the Quest "The House Always Wins I" Sometimes fails (this one is prolly know by a lot of people allready but i guessed i'd type it out also)
* Game also crashes on random occasions ussually right after a quicksave (so far this has not resulted in a corrupted save for me yet, but i had my fair share of game breaking bugs which i had to work around with Console commands, most notable the Doors of the Lucky 38 dissapearing as mentioned earlier)
* Come Fly With Me, broke the game for my brother, when finished his game crashed and any savegame created in close time of completing would result corrupted
* not sure if this is a bug, but almost every time i entered Freeside a king member comes running towards me saying he appreciates the help and gives me a random gift, after 20 gifts this is getting a bit dull. tbh 1 time is enough
* same goes for the NCR Radio, i have had that given to me at least 4 times in the course of the game
* NPC's that get too close in V.A.T.S. will dodge all ranged attacks, i dunno if this classifies as a bug but i found it damn annoying to miss a shot at close range. died numerous times because of it.
* Companions are [censored], they attack anything in sight wether you put them on Passive or aggressive.
* Companions get stuck at some parts in the game
* Companions Sometimes dissapear (happened like 6 times with ED-E for me, i eventually gave up and sent the bot back home, the combat tune was starting to get on my nerves too
* Companions annoy the hell out of me with their constant lines of text, Example Boone: "You should let me take that shot next time", or Cass: "Waste of Ammo" While A: the target i was shooting at was HIT and Damaged or B: Hit and Killed in one shot.

besides the pletora of bugs i just typed some thoughts on the game:
thats all i am gonna type for now, am tired and frustrated, the game has good elements but i disliked the story line since you cannot continue to quest after it is finished.
the weapons you could craft in Fallout 3 don't seem to be present in new vegas either, kind of a letdown tbh.
the game's ammo crafting and such is neat but a bit overrated, it's too much of a hassle to gather the resources for the ammo i'd rather just grind mobs for loot and sell that to buy the ammo with.
i'd rather be able to craft upgraded versions of weapons or maybe even mods for normal ones.

WORST bug of them all- and also occurs at Vault 3. This bug, obviously, does not occur for everyone but it does seem to happen consistently if you reload a previous save and then repeat the exact steps leading up to encountering it. That being said, it has been very frustrating to figure out a clear way of avoiding it as it seems many combination of actions trigger it. It's possible that something else much earlier in a playthrough triggers the glitch which only presents itself as save-corrupting nasty death after REPCON and/or Vault 3.

I'm glad I didn't encounter the Come Fly With Me glitch.

I've experienced bugs trying to complete I Put A Spell On You, Raul's sidequest and For Auld Lang Syne. The option for Arcade to join after completing his quest won't show up, even though he is in the Lucky 38. This is worse than before in that he won't join no matter who/what I have as a companion.

SO far....and not on main OP list

1. NCR ambassador not contacting me at all. I cant side with NCR.
2. After reloading weapons, they are frozen for few seconds (3-5 sec) and i can fire or change them. This bug is usual during fight and i died x times cause of it.
3. Some objects are in my inventory, bugged and will stay they forever cause i cant drop them even i used them for quest. (motto runner helmet for example)

+ i can confirm more than 80% from OP list

i stoped playing until they clear this mess.

bug that pisses me off the most is that achievements don't trigger, i have had 3 chars level to lvl 10 allready and i still don't have the achievement

For my money, the VATS bug is the most annoying one. I can stand the other bugs; most of them can be fixed with mods. This, however, is an engine bug, and a key gameplay mechanic broken.

I have to say I've been very lucky with regard to bugs, apart from the game freezing twice in 30 hrs which is not to bad, Come Fly with Me went fine on my 360 but last night I'm in the Train Tunnel to Nellis and the room off the tunnel appears to have a floor although the tin cans keep dropping through the floor regenerating and then dropping again again and again, I can't get into the room I just drop through the floor to reappear at the tunnel exit closest to the air force base. I can't get in to explore this little area, similar thing happened in The Pitt DLC.

I'm a trained combat sniper with years of experience but i'm just going to start shooting at everything including the wall of a building with an unsuppressed rifle while on a covert ops mission! I HATE YOU SO MUCH, I'M GLAD YOUR WIFE IS DEAD BOONE.

I told Boone to wait outside while I went into interogate the prisoner at Camp McCarren, when the prisoner went red to attack me Boone blew his head off through the door.
Boones AI is so screwed up I ended up stripping him off all his gear and leaving him in the middle of nowhere in his underwear.