I'm not saying that it was a total flop; I put off watching the movie until I had read the book, otherwise I think I would have enjoyed it more. I'm the same way about the Harry Potter movies; they're no where near as good as the books. But it's just who I am; if I really enjoy a book, then I am going to be critical about how they do the movie takes on said books.
What really dissapointed me about the movie of Eragon is that it was only an hour and a half long, so they took alot out of it. They could have let it be a little longer; the Harry Potter movies are around two and a half to three hours each and there's still alot of stuff missing from them! I'm just saying, that if they had let the movie be a little longer, then it could have been even better; though to be fair, it was a good movie in it's own rights. It's the same thing with KH2; I really feel that there could have been alot more in the plot if they had just done another disk. But that's a completly different subject.