I just read a book that comes close to the WORST BOOK I've ever read. It's called Monsieur Frog by Nikki Barrowclough. Another WORST book ever is Eat, Love, Pray by Elizabeth Gilbert. I hated it. Just hated it.
A lot of people list it as their favorite, and it's one of the 10001 books to read before you die. I was quite saddened to see that. I wrote more about why I didn't like it in my review, but I couldn't quite be thorough because my best friend had recommended it and I didn't want her to feel put down.
Hands down it was The Healing Powers of Chocolate. Click on the link for my review. The author disputed my review on Amazon.com. I responded by directing her to the reviews of her book on LibraryThing which said more or less the same things that I did.