You can really say the same thing about every role in this game, I have run multiple dungeons that the dps are just not really doing damage and dungeon run takes what feels like an eternity. Why do a big pull if the dps are just going to single target? You are going to run into this alot in game, but I have had more good runs than bad runs. People just really only remember the bad rujs, then come to the official forums to complain about their one bad encounter.