So close and then falls apart at the end.

The good: I have always found Yagno one of the worst darklords. He always struck me as an idiot darklord who probably spent his days eating his own feces. This adventure changed that making him an interesting, complex and almost sympathetic villain. The adventure managed to keep Yagno from either of the two most common evil cleric tropes: insane madman or political opportunist.
G'henna may not be the scariest domain, but it is possibly the most unsettling domain, since it represents a collective madness. The encounters in the city include a lot of interesting roleplaying challenges like how the players will handle people willingly starving themselves to death. The adventure manages to double as a sourcebook for G'henna without sacrificing any pages of the adventure.
Rather than using heavy handed tactics to force the players through encounters like a lot of second edition adventures, the module simply gives the players the rope to hang themselves with. The Bad: The ending of the adventure exemplifies all that was terrible about second edition adventures. The players stand on the sidelines and watch the two antagonists slug it out without any input from them. The rebel group is called "The Circle of Darkness". Any halfway intelligent group of players is going to decide (correctly) that the rebel group is not on the up and up solely based on the name.

There is so much to love about this adventure that it is hard to handle how badly it flubs the ending. With a better ending it is a 4 or 5 star adventure.