I'll admit, I wasn't overly impressed. But I will say that might have been down to the fact that I seemed to be the only one at the table other than the DM's son who wasn't part of the same regular group, so there were a number of asides and in-jokes that I didn't get, and that could have coloured my experience.
But I'll say that I didn't think the adventure felt particularly 'Dark Sun'-like, even though I was playing a Mul, and we were searching for a water source. Now this could have been due to the almost complete lack of role-playing going on, aside from a tiny bit during the skill challenge (which our party pretty much breezed through), but given that we ended up with our templar almost becoming the first person to drown on Athas in centuries, it didn't seem much different to any other dungeon crawl to me.
Now I haven't read the adventure, so this could have been down to the way it was run / played, rather than an issue with the adventure itself. But it didn't grab me as much as I had hoped it would.