WHO CARES IF IT'S LIKE MW2, WHY CHANGE A WINNING FORMULA?
Yes, it plays nearly identical to MW2, but people complain when a game ventures too far from its original roots and also complain when not enough is changed. MW2 was hugely successful and an extremely addictive game that many still play today. MW3 has new weapons, maps, killstreaks, classes, ways to upgrade your weapon, etc... This game is just FLAT OUT FUN. It is extremely addictive, and the multiplayer has been perfected. The gameplay is extremely smooth, and once you sit down to play some matchmaking, it will be hard for you to leave.
There is ENOUGH NEW STUFF to make genuine COD fans happy, but you guys should be happy that they didn't change too much, because MW2 was so awesome, it didn't need to be changed.