To me it just seems like CoD is adding things rather than improving or changing things. Then the fact that it's so repetitive makes you wonder if they know how to draw the line between the saying "don't need to fix what isn't broken" or just being so repetitive.
Then people tell me, "Oh what about Spec Ops Survival?" Well still, to me, that's just a combination of Treyarc's zombies mode and Infinity Ward's spec ops mode. Now I'm not assuming that it is, just that's what it looks like when they showed it.
Then the companies sorta make me facepalm when they try to explain certain things. For example, how quick scoping in Black Ops was made more difficult in multiplayer (but not zombies) for the childish reason that "it's cheap" is so stupid.