Too many people complaining about the single player. If you ever thought these games had anything to do with single player whatsoever, you rode on the short bus as a kid. This game has about as much to do with single player as World of Warcraft, haha.
Played MW and MW2 single player for about 5-6 hours. Played them online for 100's.
If you don't want to buy it, don't. They'll be laughing all the way to the bank with their $1+ billion in sales.