I like the levers hidden behind bookshelves. That is a nice finishing touch. It seems like a fairly short quest - I finished normal quite easily on an 18/2 cleric without shrining. Hard solo I shrined once, but wasn't exactly using any tactics or SP conservation. Epic was pretty easy - it took me 17 mobs before I died, and that is on a new character with zero raid or twink gear (not from my main server - it did a quick run to cap on Khyber, and I copied it over to Lama back in Nov? right after hitting level 20).
On normal, I took my time and had to cast buffs twice. I went through afterwards on hard without doing optionals, and it seems like it is over pretty quickly. While the XP seems low, this quest will be farmed in a lot less time than something like the Vale quests. I did elite with a party of 4, and it was pretty easy. Nothing like some of the elites on the Harbringer or Lord of Eyes chain. I'd like to know if there is a difference in rewards between smashing and cleansing altars. Others in my party did not get the option to cleanse them, so I'm not sure if that is class specific or alignment specific.
I really liked the inquisitor's and the novice's healing amp on epic. I was able to pull some mobs back to them, and they would help out. Not sure if that is WAI, but I kind of liked having some NPCs to help out. I did manage to watch the inquisitor die on epic after I died. I'd like to know if you can still finish the quest with him dead, but didn't have time to find out. I didn't think to buy a rez cake or store mana pots.
I did not like how the end bosses just sort of stood there with their backs to me until I attacked them. For some reason, cleric bosses in this game are really easy, but bard bosses are brutal (Hazadil and the boss in Chains of Flame). You should transplant some bard code to the Rakshasa bosses in there. All of them, including Gnomon, took the short bus to the quest.
I found it refreshing to be on the receiving end of Divine Punishment, and made sure to stay out of line of sight after I got hit once, since taking a stack worried me. Pale Masters probably won't enjoy that as much - the ones I ran with were taking a lot of damage in Lich form, and one died pretty quickly after failing concentration checks. Vampire form would be suicide, unless they let someone else grab and hold aggro.
I also reported a few bugs. Map was not working. Social panel was broken. Storyline continuity was poor - I could find the dead novice, and then run back and talk to him in the parking room near the entrance, alive, and standing with Gnomon. I'd also like to see those rooms connected - after I find the apprentice, I should be able to work my way back to the room that they parked themselves in.