They already answered this for endgame content.
Because players have griefed and not pulled their own weight while others are expected to coordinate what they need to do in order to get a quality match.
If you need proof of that, go do a lfg raid on HM with a bunch of first timers or people who are simply their for the rewards, but don't put up the damage numbers needed...
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Edited by Alucaz: 3/25/2016 12:28:41 AMWhat's the difference? Crappy LFG team mates or crappy matchmaking team mates? One method just makes it quicker to find crap.