When I watched this movie I was a bit thoughtful. It reminded me a lot of a B version of "Lord of the Rings" or something like that. After some research, I discovered that it is based on Christopher Paolini's books. In fact, after blockbusters like "Harry Potter" or "Lord of the Rings", literature and cinema were filled with fantasies. On the other hand, the studios bet so high on these films that they try to force the making of trilogies and franchises. This is quite evident in this film, with its open ending announcing a sequel that wasn't made.
The script is simple: a magical land was ruled by knights mounted on dragons and everything went well until they became corrupted, fought each other and one of them betrayed all the others, killing everyone and becoming a dictator. Now comes a new warrior, who must be able to unite the resisters and lead the revolt against him. Simple and predictable most of the time, the film never proves to amaze or move us. In fact, it's usually empty and insensitive, with a promise of romance that never materializes and the almost total absence of emotions. Even action scenes seem so unrealistic that we never feel real danger (partly because there isn't much empathy with the characters, so we never care about them).
Ed Speleers is a stranger to me and is still very young, so I don't understand why they didn't hire a more experienced actor. It was a casting mistake and he was never up to the character. Jeremy Irons is excellent in his role and stars in some of the best scenes in the film. Rachel Weisz was competent in the task of giving voice to the dragon, Saphira. On the other hand, John Malkovich looks a lot like himself and Sienna Guillory was unlucky with her character, whose importance we will never know because the film would only reveal it in the sequel. I believe that the bad casting options and low acting performances is due to the bad material given to the actors. Another problem I felt was the editing of the film, which made it's rhythm rather irregular, with a lot of dead moments. Technical features, however, compensate these weaknesses: CGI's good and cinematography, colorful and bright, is a feast for our eyes. The choice of sets and the design of costumes were judicious and everything was thought to the smallest detail. The soundtrack, without being amazing, performs very well and suits what we are seeing on screen.
"Eragon" might have been much more interesting if they had made this film without thinking about sequels and if they had put in the main role another actor, more skilled in the task of showing feelings and gaining our empathy. Despite being a forgettable film and not deserving of being considered good, its regular enough to be watchable.