The writing is nothing special and frequently clunky. The characters are all iconics, and some get less depth than others. The new iconics from War of Immortals join in and are clearly there to meet a requirement. They're paper thin and terribly underused.
Speaking of underused, for a novel titled "Godsrain," the plot has very little to do with that event. The primary events are already in motion beforehand and seemingly untouched by it after.
There's also some confusing similarities between an element of the novel and things that occur in a few PFS scenarios, like all authors were given a tidbit and they fleshed it out in contradictory ways.
The pacing is wonky, with most of the story consisting of "find clue, go to place and talk to authority about clue, get pointed to another clue, repeat." By the midway point, there's were about 4 different macguffins the party were chasing and their importance was still utterly nebulous. The stakes were always high but unclear.
Around the third act, things gel enough to make for a fun ending, but it limps along to get there.
It drops a few neat lore tidbits, and both Ezren and Merisiel steal the show throughout.
In the end, I've read better Pathfinder novels. And FAR better non-Pathfinder novels.