+1. I spent 2+ hours the other day trying to clear lvl17 with pugs, and kept getting fractals that they could absolutely not clear.
Cliffside: Would get to the seals that need to be run between, and they absolutely could not survive. Tried leaving 4 on one side, and I would get a charge and hit the other side and run back. They would eventually wipe.
Grawl: They could not stay alive at the last boss, I spent most of the time just rezing them. Apparently it is too hard to dodge the fire arrows or just strafe back and forth so that 90% of them miss. But eventually it would go into its shield and spawn a ton of lava elementals, and they would die and not even try rallying on low HP elementals, and I'd be left with ~6 elementals and the boss.
Honestly the worst classes were thieves and elementalists, they died so quickly so often that I almost want to refuse doing any other fractals with those classes. I understand that good players should be able to properly stay alive, but when dealing with PUGs the classes with naturally higher HP just seem to seem to be harder for them to screw up.
And my biggest gripe: No matter the circumstances, people yelling at you for not rezing them. Sure buddy, I'm at 1k health and my heals are down and you're surrounded by a bunch of vets, I'll come and charge over to rez you for the 10th time.