I'm tanking those on my guardian, and I'm seeing my healers struggle to keep up with the damage on a few trash packs
I digged up a youtube with a shado-pan run (not mine), http://www.youtube.com/watch?v=YsQi62HP59w look at around the 17:00 mark and 26:00 mark
First mobs (@ 17:00 mark), packs with Volatile energy sha's, those seem to explode dealing aoe damage, coupled with RNG breath thingy from the other mobs, if timed "correctly" then the fecal matter hits the rotating cooling device (almost wiped last nite with a 2 melee + tank setup) on those.
Second set of mobs (@ around 26:00 mark) I reached red health and the 2 melee dps died.
Granted, the healer was new to the instance, but is there something that can be done to lessen the overall damage short of using CC? (I'm hesitant to rely on PUG's ability to respect/not break it)