A great foundation, but overall, repetitive.
It's biggest downfall is it's repetitive nature. There is no climbing or puzzle solving. Just running, taking cover and shooting. Thats it! Over and over again. For this reason alone, the game feels a few hours longer than it actually is.
The PS3 is lacking in games like this, so not having a 360, I got this for PC. I'm pretty sure the experience on console trumps the PC by a substantial margin. Not with graphics or accuracy, but with a more social experience while playing.
I recommend this game, especially if you have a 360 and a willing friend. It's good fun. Just don't play for too long, or you will be sick of it before you know it.