It's forced into melee only, which is what most people seem to want.
It shows the KDR of each person in the match right before their round, and the two best players at the half point and end of the match are counted as "leaders" and have a leader vs leader final skirmish, which is just cool to watch. Both leader vs leader and support actions (one spectator on each side can attack or heal if the bar for the ability has filled up, which is dependent on you team's taken and dealt damage) are optional; just ask the room owner to enable/disable them.
It's a small room, which is good for being melee only, but it still has wall jumping and no death pits.
It's 1v1 over and over again. The winner of the previous round continues in the next, unless they hit a winning streak. If the streak is long enough and is beaten, a message appears telling you that it's been broken, which has a nice "c-c-combo breaker" feeling.
I think most of the people that spam Melee ST-2 would actually like it. If you want to find this mode, keep going past Random in the match type selection list.