Not really a group game I suppose, but I love
Toribash. Which is a game that gives you full control over a human-like ragdoll that has orbs, which stand for every major muscle group. You can contract, extend, relax, and hold each muscle group as you please. Gameplay differs per game mode, but in something like Judo you each have 30 seconds to make your move(control the muscle groups) which runs for something like 70 milsecs on the timer or whatever the time up there is. When the replay is shown it moves full speed without the pauses in between to show you doing your moves. Oh and if you get curious about the character customization, that's done minecraft style, but you have to get points from winning matches overtime to unlock all of the customization stuff.
The first video has a bit of pvp, as well as just some typical demonstrations on a dummy. The second video is all break dancing, just to show the fluidity and control given to you. (None of this is easy, and you will have the hardest time just learning how to move at first)
