It's the same crap that's been going on since mw1 and mw2 , repackaged into a new $60 game when it really should be no more than a $20 dlc for mw2....
I mean, it plays exactly like mw2 , they recycled lots of weapons, animations, models, buildings, textures, sounds, and even the menus from the previous mw games..
The engine is terribly dated, for a AAA 2011 game this is unusual, it looks like a game from 2007.
The singleplayer is boring, 3 hour cliche linear corridor over-the-top Michael bay style with explosions every few seconds to distract you from the poor visuals, the intense moments are either scripted events or cutscenes, and the story is forgettable near the end...
The multiplayer is exactly like mw2 but with a few extra modes, the maps are like little mazes; there are always walls a few meters between you and no open areas, all you do is run run die-> run run shoot die , the spawn system is still broken you spawn with enemies behind you and such, they still have the overpowered killstreaks and perks that give people an advantage over one another, the tactical nuke from mw2 has been replaced with another game ruining killstreak..
What a waste of money and another cash-in for activision , better save your hard earned money for better games like skyrim and BF3.