If one of my friends wanted to play MW3, I'd just tell them to take their MW2 disc, and draw a big 3 over the 2.
There, MW3 cheap.
Seriously though, the story is just... Bad, in my opinion. And where's the teamwork in Multiplayer? And WHY oh WHY would they blow up a child? Activision took out the World Trade Center towers because they thought they would be to controversial, yet they blow up a child? I really don't follow that logic.