While the hooks into the adventure could use some work (fortunately I've been running my players through the hardcover and just found a way to get them to executioner's run besides the hooks the adventure provides), this module does a good job of making the dungeon-crawl feel dungeon-crawly without actually needing any maps.
The catacombs are sufficiently creepy with a teensy bit of effort on the DM's part.
The provided monsters and encounters (especially the Spawn of Kyuss) are well-balanced for party strength.
The chess section gave my one player with Dragonchess proficiency a time to shine! He rocked it! Huzzah for making use of otherwise-useless proficiencies!
The final fight is a mess. The rules for the mote are scattered across three pages, so make sure you read and reread those three pages and make sure you're intimately familiar with how the encounter is supposed to work. The things I missed in my playthrough:
- The tentacles actually have an AC and HP separate from the Mote -- I used the Mote's AC and just guessed that each tentacle had 1/6 of the Mote's HP
- The captives have 0 HP -- I thought they were at full health, so they immediately joined the fight once freed, which made the escape sequence SUPER easy because they were all conscious and only the PC that died had to be carried out
As written, it does not seem that there is any way for the players to learn Jaru Tasca's name. There also is no explanation of what she is. Undead, certainly, and a spellcaster, but what kind? Is she a lich? There's no mention of a phylactery, so I doubt it, but I floundered for what to call her.
Despite its flaws, though, the module told a fun story, the flameskulls and Spawns of Kyuss provided fantastic challenge (and instilled a new phobia of being in "Fireball Formation" in my playgroup), and it's great fun. My recommendation is actually to run this after DDAL07-07 and before DDAL07-08 -- we ran them in that order due to DM illness, and the story seems to flow better that way. Just don't mention at the end of DDAL07-07 where the masonry came from. Tell them at the start of DDAL07-08!