I have no clue how Bungie set up the quit ban process for Halo Reach, but I'd do something like this: 10 points over your last 30 matches before you are on the quit ban. (Levels things out among people who play just a handful of matches per day and those that are constantly in matchmaking.) If you are the: 1st to quit a match: 2 points In the first 50% of your team to quit a match (or first 50% overall in FFA): 1 point In the first 75% of your team to quit a match (or first 75% overall in FFA): 0.5 points In the last 25% of your team to quit a match (or the last 25% overall in FFA): 0 points This system would penalize the people who dump out of a game first more severely, and not penalize those who end a lame slayer match that has devolved to 1v4 with the single guy hiding in a corner.