I don't even plan on buying it. I own every single Call of Duty game. I even bought the special night vision package for MW2. But each new installment of CoD is progressively worse. And to be quite honest, it is the same thing over and over again. Online play is made virtually unbearable with the enormous amount of morons, kids, and glitchers.
I've never gotten all achievements for a game. I just don't really care that much for most games. But I did work hard to get 100% for Red Dead Redemption. I put a lot of time into that game and was proud to get 100% (story, not achievements).