Fucking Twilight, good as a book, then the movie ruined everything, I can't read twilight without imagining the lifeless zombie Kristen and the constipated face of Edward.
The Twilight Saga. I admit I was obsessed with the libri when I first read them. Then the Film came out and that obsession with the libri kind of just went away. The Film were just awful. Maybe if they had a different cast, the Film 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 libri 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 Film either, the libri are okay, but the Film were not. I thought the soundtracks were great though.
ALL of them. Every single fucking one. Book-to-movie adaptations are horrible. Although if I had to pick one it would be Eragon, they fucked that one up pretty bad -.-