Didn't read many YA books in 2016, but well:
Night Study by Maria V. Snyder: Has anyone else here read her books? I really enjoy them, but I guess she isn't that famous. Night Study is the 5th book in the Study series, or the 2nd book of the 2nd Study trilogy, depending on how you count. I liked it more than its prequel Shadow Study which was also a good. I love the characters in the Study series and the story was also interesting. I'm looking forward to Dawn Study which will be released in the end of January.
The Queen of the Tearling by Erika Johanson: The beginning was a bit slow, but I still enjoyed reading it. I liked the protagonist well enough and the other POV characters were also interesting.
Empire of Storms by Sarah J. Maas: I agree that her writing has improved, but I still liked this book less than it's prequels. I'm not a big fan of romance, so I prefer YA books with less romance. Empire of Storms. had a bit too much romance for me and I had the feeling that everyone had to get together in this book. Can't one character stay single? Is it impossible for a man and a woman to just be friends, do they really have to become a couple? I generally don't have a problem with authors introducing new POV characters in the 3rd book (or later), but I don't really like Aedion and Rowan that much. I preffered Dorian and Chaol as characters. This book didn't include any Chaol chapters. Dorian has become a really interesting character, but he had very few chapters in this book. So, while it had an intersting story, Empire of Storms didn't appeal to my personal taste that much.
I'm currently reading The Invasion of the Tearling and I'm enjoying it so far.