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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With disconnects and random lag being so prevalent I wouldn't want something too strict. Just something that would penalize after several left matches with a certain time.