Just downloaded this game, about to give it a try, will update this post and tell you what I think of it. Apparently I've heard it's similar to TF2
Update: So I've played a couple of games, it's actually really fun. I did 2 games of Zombie Survival which was good (even if I did have the lowest score lol) Then I did 2 games of Team Deathmatch, which was kind of okay. But it seems as though the game heavily favours the ranged classes, as I picked a boxer and was having trouble even getting close to some people.