The reason the Modern Warfare series were the greatest franchise in history was the collaboration of Activision and Infinity Ward - like Lennon and McCartney.
During MW3, Infinity Ward walked out due to some dispute. Treyarch is the maker of the Black Ops series - they are nowhere near the level of Activision and Infinity Ward.
At $109 I won't be buying it. But when I do get a copy, it'll be 8-14 hours straight of gameplay at a mates, start to finish. None of this gamer addiction shit. Play it straight through to the end. Come out the other side, its like coming back from a holiday psychologically - fuckin great.