The Twilight Saga. I admit I was obsessed with the Bücher when I first read them. Then the Filme came out and that obsession with the Bücher kind of just went away. The Filme were just awful. Maybe if they had a different cast, the Filme then would have been better. Who knows.
That Percy Jackson movie that came out in 2010 and The Hunger Games. I'd read all the THG Bücher before seeing the movie and I expected it to be as epic as the first book was. It wasn't. I really like the series and hope the 2nd film will be better.
Eragon, the book is awesome but I just didn't like the movie. And I'm not a huge Fan of the Twilight Filme either, the Bücher are okay, but the Filme were not. I thought the soundtracks were great though.