Alright, finally finished downloading and played three games (after some off-line practice with bots). It's very fun, it reminds me of Alien Breed a lot, which I liked. There's one thing however... communication in this game is vital just as much as it was in Left 4 Dead, or else most players wander alone, or we get separated and things get ugly very fast. I've only played with strangers and so far only one game out of the three played "properly", everyone tried their best to stay together and we completed the mission (without microphones), but that's going to be rare. I'd say that as long as people play as a team, friends or not, then it's a fun game, I like it.