CR can be rough. You need to DPS those skeletons with that AoE sh*t down really fast, and the boss that spawns clones can wreck inexperienced players. There's one other room I hate, where it's a bunch of lancer mobs that if the pull is too big, there can be lots of trouble.
Yeah, I played through it a lot on my Slayer so I knew the drill. Last run, we only got as far as the first boss. Players rushed in before I could drop motes, largely ignored the motes I got down, adds all attacked me and no one bothered to try and aggro them off or burn them down. After my second death, one player kept saying "resheal" which I finally figured out was him trying to tell me to resurrect myself and heal him (innovative plan, thanks for sharing) so I had to inform him that unless he wanted me in Tulufan, hitting the res button on my screen wasn't such a good idea. This was the same person who gave monosyllabic commands for the obvious the entire run ("aura", "heal", "mote"). But it was more communication than anyone else had.
The run before that, we cleared everything except the cloning boss. He ultimately beat us down but my biggest issue there was the slayer who kept staying glued to the tank's hip, forcing me to split up my healing a lot more than I should have had to. And, naturally, said slayer refused any understanding of the whole "mote" concept so I had to actively heal him.
Both times were exacerbated by a low average level (36.x) and probably undergeared people.