As do I, but like I was saying with GrimFandango, human difficulties and playstyles can differ so greatly between each other. You can play against 3 friends, 2 of those friends may be fantastic at the game, while 1 isn't so good. Hypothetically, if all three of them pick the same character, the difficulty is going to be wonky seeing as it would be comparable to two level 9s and one level 3. The only reason I said fighting three of the same character on the same difficulty, is because it would be an even difficulty as well as playstyle, seeing as the CPUs really don't differ that much. I just think it would be a cool thing to try at least, just to see if you could do it. That is probably just the casual player talking, though.
Sort of like that "300% challenge" idea someone posted.