Why are people collectively exiting a match when they're the losing team? To spare their k/d? Because they can't accept they are bad players?
I think they should be punished, by getting some of their experience robbed, or a random item removed, or a handicap in their next match.
Edit: Bungie knows when you've been kicked because of bad internet, otherwise they couldn't tell you so. So that isn't the problem at hand here. And a time penalty isn't a big deal when you have an emergency going on.
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How about we do the TF2 MvM thing? Leaving several times will cause you to go into 'low priority' where you will be near the bottom of the list for matchmaking