What I played of the game wasn't bad. Had it come from a new studio, I'd say it was a great first effort. Problem being that this isn't a game from a new studio, but the sequel to a game from a studio that has been around for some time. I thought Resistance was a good game suffering a bit from Insomniac carefully stepping into the genre, and that the sequel was going to be quite simply great. There's no excuse for it to not be great, really. What I played was a blend of COD and Halo, with only a little bit of Insomniac mixed in, and I expected a hell of a lot more from this company at this point. Average doesn't cut it.
I guess MP and co-op might be good by some standards, but it's not interesting enough for me to move away from COD4. And it didn't help that I was in the KZ2 MP beta, either. A round of Killzone 2 MP provided a better co-op experience than anything I found in R2.