My most favourite one is Black Ops 2.
Modern Warfare 1-3, black ops 1, and cod 2 are also great.
Advanced Warfare, BO3, and infinite warfare are "meh"
Ghosts is utter shit (sorry OP) :P havent played the rest
I havent bought or owned a cod since black ops 2, for a variety of reasons. played them at friends houses instead.
I despise Activision and was planning to not buy anything from them ever, but WWII looks stellar from the gameplay and reviews i've seen, I might pick it up on a deep sale sometime in the future, if only to support Sledgehammer games. Also I've heard that microtransactions are toned down compared to some previous cods, (someone fill me in with the details) so I might give this one a chance down the line.
Bet with Intrinsic:
The Switch will outsell 3DS (based on VGchartz numbers), according to me, while Intrinsic thinks the opposite will hold true. One month avatar control for the loser's avatar.