Modern Warfare 2 was a disappointment for me. While Call Of Duty 4's multiplayer always had a sense of balance MW2 just added so much with so little thought that having a close competitive game was very few and far between. Basically whoever got those kill streaks first could pretty much dominate the game to the point where the second half of the game became the losing team trying not to have their precious K/D ratio completely demolished. Also fuck akimbo shotguns.
I shouldn't have to elaborate on the problems of the campaigns "plot".