I have experienced this module as both a DM and as a player, and it was fun both times. While I prefer the first half of this duo (Durlag's Tower), the Tomb aspect was a good time as well. Definitely falls under the dungeon crawl category, with some interesting traps (which also proved to be confusing at times) and some terrific combats (which also were confusing at times).
If anything, this module could benefit from some clarifying points. One such detail was brought up by players, and was quite nitpicky, but also made sense...if you have a trap drowning you in flammable alcohol, and that alcohol is pouring down stairs into a room with lava...is everyone just screwed from the get go? ;) And in that same lava room, the map could use some thought on the monsters hiding there, their size, etc.
However, overall, I enjoyed this module from both sides of the DM screen, and have often recommended it and its predecessor to DMs looking for something to run!
[4 of 5 Stars!]