Quick answer Configuration it's what you have on your PC from hardware to software from registry errors to whatever. A patch might do wonders for you but might screw my game up cause of the difference in our rigs. That's why developers are leaning more towards consoles and less towards PC's my xbox360 hardware setup is just like yours, same vid card, same drivers, not much difference (unless you modded it than that's on you), but my PC can be way different. It's easy to develope a game for a console cause you can actually bring in that console and work out the kinks. It's not that their rushing to bring a game to market in most cases. It's just one of those things you can't avoid no matter what you do, some PC Gamer is always going to have problems, and blame it on the game
Which would be a nice convenient excuse and all for Obsidian if not for the fact that the console versions are suffering as well with the XBOX360 tech support forum being about as active as the PC forum. There's even some commonalities at play here with the XBOX version seeing the "Come Fly With Me" saved game corruption issue that plagues PC users.
And looking at a more recent hyped release in Call of Duty: Black Ops, that looks to be the case there as their Playstation 3 version is hurting.
Even normalized hardware cannot hide shoddy production value.
[Edited by kbernstar, 11/11/2010 7:14:31 AM]