This game feels more like a map pack for MW2 than a brand new game. It should be called MW2.5
This game doesn't have enough new changes to warrant a 59.99 price tag. They didn't even bother to change the font on the UI, it's almost a copy and paste job from MW2. IW put very little effort into this game and it shows, everything is recycled, the incredibly short, convoluted campaign which doesn't make much sense and instead settles for cheap thrills rather than decent story telling that this series was known for. The MP is just like every other COD before it, nothing really new has hcanged instead of some perks being reshuffled and slightly tweaked. Again, very few changes to make it worth 60 dollars.
In this economy, better stick with last year's CoD as you'll be having pretty much the same experience as if you were playing MW3. Except you'll have saved some money.