I had a bookmark once that said that, and I loved it. You could also say Never Judge a Movie by it's Book. After all, books and movies are completely different storytelling methods and it really isn't fair to expect them to be the same. Still, when it comes to the books we love, we want the movies to be true to them, don't we? And what writer hasn't wished to see their books turned into movies? I know I have.
I've never read The Lightning Thief, but I absolutely hated the movie. It was boring, trite and cliched. I'm told the book is better, so I may give it a try, but my experience with the movie makes me reluctant to do so. Sad, huh? Ditto for Eragon.
A couple of movies that I loved, despite bearing almost no resemblance to their books are Cloudy With a Chance of Meatballs and How to Train Your Dragon. Completely adorable movies, but they almost have nothing in common with the books. That's okay. I love both the movies and the books in different ways.
I could go on, of course, but I won't. What are some of your favorite book to movie adaptations. Which ones did you hate?