I think it's pretty funny. I'm enjoying myself a tonight, and keep in mind I think I've already put like TWO DAYS worth of game time into multiplayer. I still haven't beaten all the Spec Ops, and I'll probably replay the single-player again. I <3 Modern Warfare 2.
It'll probably be my multiplayer game of choice until Bad Company 2. Although, I might give L4D2 a shot.