You'll never fix that problem by penalizing people. What bungie needs to do is quickly replace leavers and bribe the newcomers to stay through a losing match with extra loot and xp drops. And don't force people into match types they don't like. Also in any "competitive: match I've been in it's clear which side will win after the first or second round. No point in matches going past best of three, the tail end of most matches is tedious no matter which side you are on. Same with quickplay, the mercy rule could be invoked much earlier on smaller score deltas with no change to eventual outcome.