Well, I've been playing for over 2 hours. I finished the first two campaign missions solo, it's not bad. It will probably be better with friends though. I leveled up like 7 times in two missions.
I'm really glad they didn't do a beta for this game, because I might stay up and play all night......if I could actually connect to anyone. I'm playing on PS3. There is some screen tearing, but other than that it seems to run pretty solid. It's obviously a filler game before RE6 comes out, but it's enjoyable at least. Anxious to try co-op with my friends when they get it tomorrow, gonna go play more before I go to bed so I'm level Awesome when they get on.