House of Leaves. It had so much potential but the gimmicks became too much and added unnecessary information.

Catcher In The Rye. It may be because I read it as an adult but I just could not stand the main character. He just came off as a whiny emo kid to me. I discussed the book with someone who read it as a teenager when it originally came out and he said it was so amazing to them because they're had never been a character written like that before. There had never been a book where a young adult or a teenager was the main character and they weren't the "perfect" kid. So I can understand why some people like it, but I just do not like Holden Caulfield.