You're in Coriolanus Snow's POV for the entire book, and I personally found him awful and hard to sympathize with even in the earlier parts of the story where I think he's meant to be more sympathetic and likeable. Since you don't get any other POV and Snow is so self absorbed, it's hard to get a good measure of the other characters and a sense of who they are outside of his feelings about them. I loved the Hunger Games books and movies as a teen, and it was neat to see the origins of some aspects of the games and a little more world building about the history of Panem, but I didn't really enjoy this story on its own. The writing is as clear and suspenseful as I remembered from the series, though, so it helps get through the book quicker.