2 out of 5 rating for Dead In Thay
The best part of the Doomvault is it's map. The thing is huge, detailed, ...and doesn't come with this adventure except as a one-page illustration. The story itself is one huge grind through a dungeon designed for 20+ players at multiple tables, with multiple DMs coordinating over many sessions. Is that what you are looking for? If so, then this and Vault of the Dracolich may be the only options for you. For everyone else, save your money.