Apologies if it's already been covered, but Holly Black.
My best friend gushed and raved and was frankly /in love/ with Tithe as a teenager. I can't remember if I read that one, but she thought it was The Best Thing Ever. Sometime last year I was scouting around for something to read and saw Twitter losing its collective mind over Black's book The Cruel Prince. YA fantasy isn't usually my thing, but I remembered how much my friend had loved Tithe and thought I'd give it a shot.
Oh. My. Word.
Dear friends, I struggled through 6 chapters hoping it would get better before I could no longer read another word. The world building is insipid (They're fae~! Everything is d-i-f-f-e-r-e-n-t~!) and the narrative juvenile. I couldn't conjure up any emotion for what the characters had been through, nor any enthusiasm towards seeing how their story progressed. Plus, the main narrative seemed to be "guy is an abusive [insert insult of choice] but maybe there are, like, /reasons/, or he'll redeem himself so it will be OK". Nope. Straight-up not my cup of tea. Makes me wonder if I'm just getting crotchety as I get older, but people love this stuff and I don't.
Haven't read Cruel Prince, but Tithe was just awful. You avoided a bullet there.