There are two problems I've seen in these areas (Below the Morninglordian temple)
1. hidden doors, once discovered, disappear entirely too quickly. The dungeon takes a good 3 hours to run, and this just adds an irritating delay to it, having to rediscover/go back for others/discover once each round or so. Our spotter went through a whole stack of trueseeing potions in the dungeon (maybe the initial Search DC is a bit high as well).
2. The risk vs reward is -WAY- off balance; there's better treasure in the Vallaki crypts. Last night, after our 3 hour run and harrowingly epic battles with mid to high level undead, we came out with a Bone Shirt, a Folly crossbow, very little coin, and a stack of low-value books.
Otherwise, the dungeon is masterfully built. The spawns are well placed, there are no tileset bugs that I'm aware of, the flavor is immersing and spooky, and it's built good enough to actually take the 3 hours to do it without feeling too drawn out.
