I wasn't sure exactly what I would get when I picked this up. I wanted to see how they treated the Zon-Kuthon temple in Pangolais, and the temple to Calistria with its honeycomb ossuary intrigued me. I run and play Pathfinder 2e, so I hoped that the art (maps included) and lore would significantly outweigh the less useful 1e mechanical elements mentioned in the product description.
There are more 1e mechanical elements than I would have hoped for. That said, most of them elaborate upon the strong lore elements introduced for each temple. While I can't port it over right away into a game I might run or play in, the stories and lore to which they are attached seem like they would travel well. If you are running or playing in a 1e game, these might be perfectly fun and useful as-is; I am too rusty on Pathfinder 1e's mechanics to be sure, though.
The worst art in this book is still good. The opening spreads showing off some feature of the temple are all evocative, the maps are clear and easy to read, the NPCs well-rendered characters. With some qualifications, I can say the same thing about the lore.
The temple to Zon-Kuthon was pretty cool in that Hellraiser-cum-Catholic way Nidalese Zon-Kuthon lore tends to go. It wasn't all to my taste, but it gave me a lot of ideas for that daydream Nidalese campaign I will probably never run. It definitely does nott shirk on the torture chambers, some of it consensual and some of it entirely the opposite. It has a fair bit of presumed ableism, too, which I really do think could be peeled out of Nidal's brand of evil in a way that would make everything better for it (& I'll stop myself from ranting on there; that's some other discussion). Definitely not for every reader or gaming table, but quite good.
The temple to Calistria was great. The temple and its occupants provide a number of different perspectives on what vengeance means. No spoilers, but there is enough dramatic tension built into the temple's description that I could easily see it being the focal point for a series of adventures, or even possibly a campaign. I enjoyed seeing Calistria as patron of elven vengeance against Treerazer, too.
None of the others quite captured my imagination as the temples of Zon-Kuthon and Calistria, but I mostly liked them. Cayden's temple in Absalom is presented as a warm and inclusive and rollicking place perfect for even the most eccentric mix of good player characters. It could easily be a touchstone location for PCs operating in the city, as long as all the players involved can deal with alcohol's pride of place.
Pharasma's temple was pleasantly weird, suited to her deep mysteries. The undead-hunting Night Jars (a cool organization in itself) included two named NPCs with different ideas about what moving the undead on ideally looks like, which provides immmediate grist for the storytelling mill.
The temple of Sarenrae presented her worship in a way that helped me better understand her place in the setting. I so wish they had managed to find a better term for her ecstatic dancers than "whirling dervishes." The term is simultaneously dated, gratingly colonialist, and too tightly linked to real-life regional communities to be anything but distracting and irritating to me.
Abadar's temple...meh. He doesn't have to be the god of Inner Sea colonialism, but this temple sure makes him feel like it. And there is a chunk of 1e-era bad habits that transport nasty European colonial biases into the Mwangi expanse and Golarion and, yeah, Paizo has gotten so much better about this that this chafes all the more.
All in all, very good with a few sour notes. I am glad to have it in my collection.