Multiplayer review only.
I don't understand why people are mad about CoD campaigns and take them so seriously. It's like being offended that new Expandable movie is a dogshit. Though, I don't play campaigns, because I don't want to spend hours in a linear scripted corridor like this.
Multiplayer is really good and addictive. It's actually so good that my partner started to play CoD too, though she isn't a gamer at all and actually doesn't care about videogames.

TTK is much better than in MW2 and gunplay is so good.
Maps are cool.
No music, which is a bit disappointing.