Please add other reasons to comments.
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Matchmaking, but got nothing to do with team losing, has everything to do with their lack of ability to work as a team in team based play. Can't use radar, walking the whole time, no teamshooting, not going to goal etc. Once they confirm these it's a waste of time and I'd rather cut myself off for a half hour than get upset at noobs that are only there because bungie sucks at real teams.