Sorry, black ops 2 is so bad.
No modding and kids and futur.
DLC in BO1 is little expensive 
The only thing I find about BO2 to be the biggest s**t is the Grief mode! If that was the only thing that took them to switch zombie mod to mp engine, than it is obviously the lamest s**t they did, because they could and should have given us the 8 co-op mode to play big maps like Tranzit. That would be the real reason to switch to mp engine. I hope they will come to senses and give us 8 co-op mode in next game.
There were few attempts to make 8 co-op mode for codwaw, but the engine doesn't allow this, but mp engine does. So it would be great to see this for codwaw, that would change mappers thinking and build the maps for mp engine IMO. That's how I see it. I recall, Tom-Bmx tried once a while back to make 8 co-op for campaign engine, I don't know why, he stopped as it couldn't work I guess.