First of all: I am no "Call of Duty" - fanboy and no "Crysis" fanboy. Both games had their weaknesses, both of them had their strenghts. I'll come straight to the point: Crysis 3 will be hit in the face for Treyarch and Activision! The game is much better than Crysis 2 when it comes to animations, graphics and gameplay. Especially the multiplayer is going to be stronger than what Back Ops II had to offer, simply because of:
-vertical gameplay
-many different playstyles possible and encouraged
-VERY good map design (couldn't say that about Crysis 2 multiplayer)
-in game modes such as Hunter mode, even not very skilled players can rule the game
and many other reasons.