Quite possibly the best console FPS and multiplayer game ever!
The control are tight and the framerate is a constant 60 frames per second even with all sorts of crazyness happening.
The single player campaign is rather short on the normal setting but on Veteran every inch takes minutes to gain and it's very satisfying to finish a level on the Veteran setting.
The multiplayer is the best I've seen thus far in a FPS... especially on a console. You start with basic equipement but by gaining XP thru kill or ojectives you unlock more guns, attachments and attributes (like having better bullet damage or being able to run longer). This makes the game very addicting and you wanna play one more round just to unlock more stuff. The levels are well done and there's no real safe spot where you can camp safely. Unlike Halo, it will take a couple of good shots to take someone down.
This is the best gane that came out in 2007 and you should give it a try! It's awesome!!