5 out of 5 rating for Shattered Star Adventure Path
I really appreciate this AP.
There are TWO must-play adventures: the second one, and the fourth. The latter one is an incredibly good high-level dungeon, but the former has a plot twist so unique you have to experience it.
Adventures one, five and six are good. Number three is unfortunately C-.
So, why this AP is an -almost- must-play? There is a special Indiana-Jones feel about it. The overarching plot is solid. And there is a number of thematic elements that is present in each adventure. Dungeons (good, old Dungeons). Golems. Magical Monuments. Quests (as in Kingmaker, but only three or four per book). Unique metals. Runelords. Capital sins.
There are also nolstalgic elements from the first APs, such as Varisia, Magnimar, the Gray Maidens (and Lovecraftian elements that create a link with RotRL); Shattered Star is the spiritual successor of Rise of the Runelords, both in theory and in practice, and the Midway AP for Pathfinder 1e (Return of the Runelords, once published, will complete the trilogy). I think that SS is even better than RotRL. The art alone can sell the books. One other strong aspects is the number of compelling NPCs. Also, this AP can be enjoyed (the most?) by morally gray PCs.
In the end, A- (4.75/5). It deserves to be experienced.