The Twilight Saga. I admit I was obsessed with the vitabu when I first read them. Then the sinema came out and that obsession with the vitabu kind of just went away. The sinema were just awful. Maybe if they had a different cast, the sinema 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 vitabu 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 shabiki of the Twilight sinema either, the vitabu are okay, but the sinema were not. I thought the soundtracks were great though.