I think I kept wanting this book to be more than the sum of its parts and it just...remained the sum of its parts. And the parts were fine and I'm always here for a good feminist dig at Puritan cultures and also...definitely not enough time spent with the trolls. Troll culture was great. 
Romance aspect was extremely delightful; there's something deeply fun about playing with gender roles.
The downside was how predictable the plot felt and it feels like the story knew it was hitting all the beats in order, but didn't quite know how to shift and tell itself differently so that it didn't feel like it expected you to be surprised. When things happened, it wasn't the "Finally!" of a kickstarter getting funded when you weren't quite sure it would make it, but the "Finally." of my two year old being willing to put down the bubble wand and go to school.
Between that and the absence of deep history rather than a lot of world-building felt a bit like window dressing, it was a book that I enjoyed, but could imagine loving a different version of it far more than i liked this one.