I tried running my group through this adventure, but none of us got very excited and we had to scrap it 25% through. There just isn't a really strong plot motivation for the characters, as none of the "suggested hooks" really have a lot to do with the adventure. In fact, the whole point of the hook is really just to kind of fool the PCs into appearing in this magical place, and then their primary motivation is really just to figure out a way to escape. On top of that, the module would have the PCs searching through the wilderness for about a month before finding this area(25% per day of finding a half-elf village, 20% of having that village know anything about the area, and then 1-2 days travel time to get there.
So, the PCs have little reason to find the place, have to spend a lot of effort finding the place, and once they're there, the only point is for them to figure out a way to leave.
Edit: I believe that the only other review implies that good DMs can create a more plausible reason for why their PCs are here. That's a valid point, but is still a negative to me. A published module should minimize the amount of work that the DM has to do to prepare- that's the point to buying a pre-written module, isn't it, to save prep time? If the basic pre-packaged hook can't even really stand on its own with most groups, then the module is flawed.
Also, this is adventure has a *LOT* of quirky plot. This wouldn't be so bad if it more than just a small bit of it was easily learnable by the PCs. Unfortunately, without some strong DM creativity, most of the reasons for the goings on will be lost on the PCs and I'd guesstimate that 90% of the plot will only be known by the DM. I believe it's likely that the PCs will either treat it as a hack and slash or simply be confused as to why NPCs are acting certain ways.
Also, there are MANY sourcebooks other than the Core Rulebooks referred to in the module. Although the book says that only a few of them are "required", many monsters don't even have descriptions as to what they are, which would cause you to need these random books or search online thoroughly before playing.
Edit: Since it seems to me that it would be fairly easy to give a short, one-paragraph description of what a monster looks like and its basic reason for being, the absence of this seems to me to be a method of ensuring additional book purchases. Really, it is absoultely ridiculous to have a monster appear, and not even be able to describe what it looks like to the PCs.
In addition, and possibly most important, there are numerous challenges that are WAY too hard for the 4 3rd level characters recommended. Almost all of the major fights (4-5) are at least Challenge rating 5 or 6, and include monsters who can either do area of effect attacks, or do an attack/spell which has an 80% chance or so of killing/disabling one character per round.