So many haters of COD games. COD gets coverage because its so popular, you may not like the game and that's fine but millions of people buy it every year because they enjoy it. I like COD mostly because of the style of game play and getting to prestige.
There's nothing special about getting to prestige really but, for me personally it adds something to the game gives multi-player a purpose beyond just the normal multi-player experience. I find it similar to a single player game where once you beat the game whats left to do, well getting to prestige just gives me something else to do.
Sure COD may not be doing anything super innovative but its a fun multi-player game to play and when your in the FPS genre what is there really to do that is going to make your game so special. A FPS is a FPS no matter how you slice it.