seriously, if you looked at these forums alone you would think modern warfare 2 was the worst game ever and i realize that all the comments will say im an idiot for liking this Piece of shit game, but whatever
 
1) I find shooting stuff in games fun, and this game happens to do that very well.
2) The balance.  Seriously, I have used just about every gun in this game and if you think something is underpowered its because you never took the time to figure out how to use it 
3)Melee.  I see alot of people say how can a knife be stronger then a gun?!? Its a god damn game.  Its meant to be fun. You do know games are supposed to be fun, right?
4)Maybe i'm a minority here, but fuck dedicated servers.  Matchmaking is fast, efficient, and i dont need to worry about finding a game myself.
 
im sure i could think of alot more, but its late.... so yeah... start flaming me cause i like something popular and everyone knows its uncool to like popular things