The problem is people are abandoning duty before it even begins. And when you lose two people right off the bat, a few others are going to bail alongside them. There's never a chance for explanation, never an attempt. So the mechanics being too hard or just right are a mute point. This is a big problem, it's stopping people from progression, not progression as in lol better gear, but progression as in I can't do anything else because I'm blocked by this dungeon. As a fresh 50 dps class, do you really want to play a game where you're waiting 30+ minutes for a queue, just to have half the group abandon the moment it starts?