Enders game. Movie was a joke.
Eragon. I could have made a better movie
I was so upset at what they did with Ender's Game. They completely gutted that.
Eragon isn't a good book, so it turned out just like it should have.
Ender's Game was to be expected tbh. The pacing of the book just couldn't fit in a 2 hour movie. It would work as a series (somebody email netflix)
Also, Fight Club was better as a movie. But yes the book is almost always better, because it can expand on ideas/characters more thoroughly.