Ok.
It plays exactly the same as MW2. The graphics are average at best. The maps are as usual poor, and hardly differ. The story is rubbish, with pointless bits in which they try to immerse you, but totally fail. The ending is crap, and made me laugh. There's no new anything, no innovation, just the same game with a expensive map pack added on. The survival mode is the same as zombies, but seems to be even worse. The online system is crap, as are the little kids that hold the majority of players who play it.