I've had minimal problems with BO2 on the PS3. No freezing, little lag, no glitches yet to speak of. I've encountered the dreaded sound bug (your audio gets extremely distorted and you have to back out of the game to fix it) twice now, but that's been it so far.
I'm enjoying it, it's probably my favorite COD so far. So, I'd give it a try.
I'm going to be honest and say the game's forum is one of the worst places to come for feedback, since forums are usually where complaints and criticism are constantly incoming from frustrated people. You don't really see threads talking about how awesome something is, because there's really no point. You'll really only be seeing the bad, in other words; not the good. So, I'd go seek some formal reviews elsewhere (Amazon, perhaps, since they'll be from normal gamers, and not paid staff) to see some unbiased opinions.