There's the old adage, "if it ain't broke, dont fix it" that comes to mind here. I enjoy CoD. I LOVED Black Ops, and liked Black Ops 2. I've, actually, really liked EVERY CoD game that I've played [1, 2, 3, MW, WaW, Mw2, BO, MW3, & BO2]. They sell fantastically and they're very popular.
Also...