An in game pvp ranking system. From there, you can find matches based on connection. I.e. : I'm rank 10, so I get matched with people with the best connection who are +/- 5 ranks from where I am. Or brackets. 1-10 gets grouped, 11-20, 21-30 ect. You're trying to decide if sbmm or connection is better, when I think a combination of the two will do 2 things 1) better games 2) give people a carrot at the end of the stick. Something to chase.