I wouldn't bother to be here commenting, myself, if I wasn't annoyed at having been driven away from my copy of New Vegas for a while by the unending bugs.
Now, slowness, crashing, instability... those are very complicated problems. That, while unprofessional to let happen in abundance, is understandable from my point of view, actually... but most of the bugs I run into that piss me off are just stuff that is going wrong that is completely irrelevant to what sort of hardware or software you're running the game with. Enemies hit 0 HP and become invulnerable, characters fall through the floor of the world, the Caravan game is glitchy and broken, savegames were almost completely broken.
These are just my observations from my own play sessions. The list of bugs that people are encountering in the first hour of gameplay that are likely completely irrelevant to the size of the game or to the diversity of environments the game is run with on the PC is astounding and unending.