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In fairness, there are numerous changes which do things like ruin emotional connections (like having Saphira instantly grow up and name herself rather than growing over time and being named after Brom's Dragon) or cause issues with future book plots (like having the Ra'zac be tied to Durza and die during the movie).
They Changed It, Now It Sucks!: Largely the reason it's disliked by many fans.
Tear Jerker: The scene where Saphira lets a dying Brom fly with her so that he can truly be a Dragon Rider one last time is, despite the film's mixed reception, genuinely moving. At no point does there seem to be an attraction that forms beyond Eragon thinking she's pretty. And their flirting at the end is only their second. Except she and Eragon share very few scenes together, and their talk before the battle is in fact their first full conversation alone. Strangled by the Red String: Arya is Promoted to Love Interest - although to the film's credit, it's merely the start and hint of a romance. So Okay, It's Average: Those who haven't read the books can at least get some enjoyment out of a harmlessly mediocre fantasy adventure movie, with some great-even-if-weird effects and dragons. Murtagh's actor would later go on to become the far more recognizable Sam Flynn. Ed Speleers would move past Eragon in The New '10s, notably in Downton Abbey and Outlander. This gets pretty awkward for anyone who has read the books, given that it's revealed Eragon and Murtagh are brothers. He has more chemistry and meaningful interactions with Murtagh, who at the very least becomes Fire-Forged Friends with him. Relationship Writing Fumble: Despite the attempt to portray Arya and Eragon as Implied Love Interests, as noted below, they don't seem to make much of a connection. However it was panned critically and received a great deal of backlash from fans of the books, halting plans for a sequel. The director even said Fox were "moderately happy" with the worldwide profits. In reality, it was a domestic failure but performed adequately with the help of the international box office, making $250 million worldwide off a $100 million budget. Presumed Flop: The film is often mentioned as if it were a gigantic Box Office Bomb.