Call of Duty Modern Warfare 2

[Diligence109]

I've been on the fence about getting this game for PC. I guess what I want to ask "is it worth it? Should I go for it?" But more importantly, as LiNuX pointed out, what makes an FPS are the tiny little details in the way it plays; and those are hard to see at a glance without really getting into the nuts and bolts of the game.

Can someone with experience with the game articulate for me what the little silver lining is that makes this game awesome?