I have mixed feelings about this book....
Positives: The writing was so slow paced, it was kind of relaxing. But when things got tense, they got TENSE. Also, this actually does feel like the first book of a series - as in to say, not everything is fixed. The heroine's arc was set up but it wasn't fully developed (enjoyed the realism of non-conclusive arcs right in the first book.) The main plot points were set up but not resolved. There was the books plot, which was basically solved but there's still a lot more to discover. The author was clearly not afraid to make use of the series format to bring in slow character development and such things. The worldbuilding was done extremely well, as were the plot/conflicts/relationships that were set up. It was immersive and dark and played with symbolism pretty effectively!
Negatives: Some might find the slow pacing to be a negative, but I suppose that's based on opinion. I did at times think that the decision making and turn abouts were a bit wooden, meaning they were set up effectively, but when the time for decisions came, it was too abrupt or confusing. Also, tonally, I sometimes though the more YA elements didn't integrate smoothly with the darkness of the dark(ish) fantasy genre.
Opinion: I can't really find any fault with the mechanics and set up of the story that much. But my own negative opinions kind of stem from the religious system. It feels so...Christian in some ways - though there are enough doubts about it in-story to make me hope the religion is proved false or changed or something. I don't know...call me sexist, but it was uncomfy to see a female-based monotheism. It would've been fine, but then there was this three aspects of the Goddess (Heart, Soul, something) and...well, yeah, that bothered me a bit. Still, though, despite some of the YA elements and religion-y aspects that I didn't like muchly, I enjoyed the book. It was so well-written, much slowly paced with a lot of relaxation for the sequels and coming character arcs/relational developments. There's still so much mystery left to solve, and seeds of doubt planted in our minds wondering it all of this is even good or real or what is true...
That said, I'm going to hold reading the sequel in favor of other books. :D Basically, I liked the book and the world and the story, but I didn't much like some of its content. I'll hold off judging it until I complete the series. After all, even if the sixth book is still ????, the seventh might prove to connect all these things masterfully and in a really awesome way. Hey?
Content: A few mentions/scenes of nakedness. Not the explicity, sexual kind, though. Some non-romantic kissing. A few uses of the d-word. Also, this book IS dark with all its shadows and witches, so there can be some creepy things - this is definitely more of an older-YA read.