Like everyone else who've reviewed this book, I'd read the Kushiel series previous to this one, and much enjoyed it. And when one reads another series by an author one has read before, there are always expectations that the genre, the writing style, will be similar. This is the only time yet that I have read two series by the same author that are so blatantly different and yet both good, albeit in very differing ways.
The Sundering, unlike the Kushiel series, is not at all about the characters, but focuses entirely on the plot and the philosophical issues presented. I had to finish not only Banewreaker, but Godslayer also before I could pinpoint the moral and at no point during the books could I guess at how it would end.
It would've been easy enough to just invert the classical seven Gods, one of the evil thing, have us cheering for the "bad guys" instead. That would've been moderately original. Of course, it isn't that easy in The Sundering. There are nuances in the nuances. For a very different version of the classic epic fantasy adventure, and a comment on the whole genre, this is your book.