Hi, I know that this may not be the popular game at the time, but Double Action: Boogaloo might be a perfect game for teams. The game is mostly played competitively, even if it is not meant to be played that way. It is fast paced, fun and exiting. There aren't many things that a casual has to learn, but to be very good, there are quite many techniques as the best gun, best character, what loadout, fist fighting and when, etc. I have been playing this game for a long time and I've always enjoyed it.