I've been doing the Shroud grind for much longer than I'd like. Freakin' double shard ingredients. In any event, been running a lot of Shroud PUGs on Sarlona and have had great experiences almost without fail. In particular, the quality of healing has been exquisite.
I'm a melee, so during phase 4, I'm all up in Arraetrikos' grill, giving him a what-for. The blades close in and I always ask the healers when they want us to bail out and take another pass at him. Sometimes the DPS isn't what we'd like and we don't beat him down as quickly.
Almost every time, one of the healers says "You're fine...stay in there."
My HP bar then does the cha-cha as I get a combination of cuisinarted by the whirling blades and a kick-ass amount of healing offsetting the damage. The dust settles and Harry is dead in one pass. Boom.
So, yeah, kudos to the PUG healers out there. You might not get mad respect from everyone else but you certainly get it from me.