I have two. The Ritual and Drowning.
The Ritual is pure smut. 61 chapters and every one contains a graphic, demeaning sex scene. I’m convinced the author was an adult film screenwriter and decided to try their hand at writing a novel. There isn’t a single likable character in this book.
Drowning isn’t a great work of literature. I felt that the characters were very two-dimensional. I hated how naive the author made the protagonist. It made me have a lack of sympathy for her. The ending was series finale of Dexter bad.
The Edge of the Fall and Into the Darkness by Kate Williams.
The first Storms of War book was good, if a little juvenile, but the main character actively got worse and the story got more tropey and soap opera-y as the books went on. Very disappointing.