Have to agree with that assessment. My very first Coal Chamber run on my cleric took... well, let's just say it took a VERY long time(NONE of us had ever run it before, and nobody knew you could banish everything in there). Subsequent runs have been about as easy as any very long quest can be, the hardest thing in there now is just remembering which way to go, and when.
Paralyzers also work quite well in there, if you're lacking on banishment weapons. The easiest Coal Chamber run I've been part of was an Elite run that capped my level 19 Ranger - 3 Rangers in the group with paralyzers, and a monk who was paralyzing everything he hit. The cleric didn't have a whole lot to do except keep her aura going and hitting a burst now and then, and got somewhat bored with the run![]()