Well, my main concern would be the requisite minimum. I don't care if the free-for-all is 1-on-1-on-1-on-1 or whatever higher number one can think that'll fit on a gamemap without slowing its animation pacing. As long as you don't actually need a fourth player (or computer controlled character), I'm fine with the free-for-all. That's what I consider the purity of the free-for-all. Smash Brothers allows you to play with just three characters 1-on-1-on-1, but it doesn't offer the open map like Dissidia or Halo. I suppose my idea is more of a strategist's free-for-all because instead of simply hacking mindlessly, you may be able to find a place to hide out and plan while the others do the monkey-work.