I had two big issues with Black Ops.(Note, I played on PC)
1. The quality of gameplay, the combination of graphics, lag, hosting issues, optimization, and all that, was not as high as it was both MW 1 and 2. COD 4 was all about letting you change how you saw and played the game, and it worked wonderfully, MW2 on the other hand took the other route and let you control nothing, and it worked out well. With Black Ops it just didn't quite click I felt.
2. The community was shit. It might have just been where I lived that got me stuck with some of the worst run servers I have ever played on. Petty admins, either powertripping or doing nothing, and terrible game choices. To get a good ping, I either played hardcore team deathmatch or SnD(not a big fan of hardcore, but it has it's place), or 24/7 Nuketown which was just a clusterfuck.
In short, I had a bad time. Thus, I have no interest in BO2 at the moment, especially as MW3 pushed the limits of my old and failing computer, I think I'll wait. I probably torrent the single player, and enjoy as I'm carried through a cinematic adventure, but really that's about it.
I blame Treyarch, they've yet to do well.