Just got it today.
All I can say is I LOVE IT!!
I played for about an hour sofar, havent encountered any bugs, 5.1 works great with the fix, graphics are just superb in my opinion. FPS is 20-40, its not perfect of course but pretty playable. Playing it on Master, AI seems pretty good from what I can tell, comparable with other FPS's. I play with dynamic crosshair off, I dont like the expanding crosshair when moving, also makes aiming a lot better.
Here's some pics of the start of the game, absolute maximum settings.