I've been playing some RE6 mercenaries online with random dudes and girls, there's not too much going on, at least on PS3, but still enough that you can always find some open sessions. But some people can get really frustrating, if you put in "Playing for Fun" don't just restart or straight up abort the session just because you didn't get a perfect combo or god forbid you were grabbed by an enemy. Had this happen three times with different players. But when it all works out, it's really great.
And a bunch of times, I had the game crap out due to "connection errors". Didn't have this issue as frequently with other online games and everything else seemed fine. Is RE6 known to just do that from time to time?