The Harry Potter series by J. K. Rowling - Whiny, unlikeable characters and lazy writing. I consider it an insult to my intelligence that the writer felt it necessary to use the first chapter of each book (apart from the first one, of course) to recount everything that had happened in the previous book(s). Hurr hurr hurr I can't 'member things all good 'cause I'm a stupid Amurrican!
On the Road by Jack Kerouac - Total crap, and boring as hell. As Kim Kelly from Freaks and Geeks says: "I hated the book, alright? I have no idea what it's about, and the writer was clearly on drugs when he wrote it. I mean, it just went on and on and on like it was written in a total hurry. If I handed in something like this, there's no way I'd get a good grade on it! It's boring and it's unorganised...and I only read thirty pages of it, anyway."
The Lord of the Rings series by J. R. R. Tolkien - I feel like these books were written mainly as a showcase for Middle Earth's languages, history, and mythology. The Hobbit was okay, though, and I really liked The Silmarillion.
Richard, I'm counting on you to do this meme. Anyone else who wants to do it should, too.