The graphics seem pretty good, although the shadows are a bit jaggy, and they "vibrate" when you move (weird effect). I have to say though, I like the graphics on 360 better than the PC version.
Sound. This is an area where the game truely shines. It's hard to describe, but hearing a gunfight going on in the distance, and being able to tell where it's coming from thanks to surround sound is very cool. It's like watching/listening to a good war movie.
Only problem or complaint I have so far, is it doesn't seem like people are utilizing the microphone very much. If anyone is talking regularly, it's usually just one guy that talks his mind, regardless of manners, or vulgarity.
All in all, so far, great game.
