CoD4 is the shizzle, everything after CoD5 shouldn't be called a game.
Why do people always say this? COD 4 wasn't any better than the later titles. There are really no noticeable differences, aside from the fact that there weren't many games like it before it came out. It can claim the title of heralding the beginning of the end of the Call of Duty franchise, and the rest of the FPS genre along with it, but that's about it