So what is the worst book (or series of books, if you're a masochist) that you've ever read?
For me it's got to be 'Splintered' by A.G Howard. The premise was what drew me in: a dark retelling of the 'Alice in Wonderland' novels, following Alice's great great granddaughter as she travels to 'Underland' to undo all the mistakes that her grandmother made while fighting her own Insanity.
The whole thing, however, was an unreadable mess. The main character was a stereotypical emo school girl, her two love interests were total caricatures, and the attempt to introduce sexual tension into the narrative only served to stunt the story and make the characters more obnoxious than they already were. Mix all that in with the fact that a lot of characters were brought into the story without being introduced, and it made for a novel that felt like it had been written by an angsty teen.