Game looks great, but stutters like crazy at random times. It's not a very good PC version.
I'll try that ini tweak above. It runs perfect on ultra for me aside from the very random stuttering that happens.
I'm not really sure why looking at closed doors makes my PC drop to like 10 FPS, then goes back up as soon as they open. It happens sometimes...weird.
I hope this isn't a case of the game just running bad on Nvidia cards. Always seems convenient to me when there's an AMD/ATi logo on startup and then it has issues on my Nvidia card. (and vice versa when I had a 4870)