I agree with Jboy about COD Waw...
it´s really (I mean to me... RRREEEEAAAALLLYYYY) worst than COD 4 in every aspect. (weapons, graphics, online, single player, history, etc...). It´s a cool game, the co-op is cool. But overral not even close to what COD4 was when it was launched. that feeling playing COD4... achieve a kill streak and call the choper, the search and destroy hardcore, the perks, the graphics, when your helicopter crashes in the sinle player, I mean... it was perfect for that time. The modern warfare thing gave a really new feeling for the FPS genre. especially for the CoD series.
But, that´s my opinion. And for me COD MW2 is a GOTY! (it wouldn´t be if bioshock 2 had made this year :( )