Going to miss a couple of things:
-Actual Creativity/New Ideas from the devs - One of the things I hate about IW is that they don't even add new things or just take from treyarch
-The devs listening to community - As far as I can see 402 is JD2020 who answers questions, just ignored any input from the player.
- Devs coming through with what they promised (For the most part), treyarch failed in the releae of BO but they promised patches would be created to try and fix the game which happened in some areas. - IW are pretty much liars that haven't been found out yet i.e No final stand/second chance - puts and last stand and smiles, gun on gun action - staking killstreaks.
I really hate that treyarch cannot produce a smooth game but they do add a lot of good stuff ingame