The book's much better, but it still borrows a lot. The world, like most any fantasy worlds, is Tolkeinesque, as Tolkein invented modern fantasy, and the plot, at least of the first book, is very much Star Wars, just in a different setting.
Think about it. A long time ago in a galaxy fantasy world far, far away, there were these guys known as Jedi dragon riders who used the force dragons and magic to be the guardians of peace and justice in the Old Republic whatever they had before now. Then, an ambitious young Jedi rider named Anakin Galbatorix decided that the others were holding him back and, in a quest to gain power, overthrew the old order and hunted down and killed nearly all of the other Jedi knights riders, then started his evil galactic empire. Flash forward a bit. Princess Leia Aria is carrying the Rebellion's Varden's last hope, the stolen Death Star plans dragon egg on her starship horse when she is ambushed by agents of the Empire and is forced to send it away on an escape pod with magic into the middle of nowhere, where it is stumbled upon by a young boy named Luke Eragon, who is a poor farm boy who lives with his uncle, since his parents are both gone. Before long, stormtroopers not orcs come looking for the droidsagon and kill Luke's Eragon's uncle to find them. Then, the wisened old sage, who was once a Jedi rider himself, takes the boy on a journey to deliver the plans dragon to the rebels on Alderaan Varden in the mountains. Along the way, they run into a jack-of-all-trades loner scoundrel guy, who helps them save Princess Leia Aria, killing Obi-Brom Kenobi in the process. Then, when they go find the rebels on Yavin Varden in the mountains, only to find that they have led the Empire there. Then, an epic battle ensues, in which Luke Eragon must use the force magic and his dragon to defeat the Emporer's ultimate weapon, the Death Star a shade by hitting a small, thermal exhaust port, right below the main port his heart. The rebels Varden win, and we go on to the sequel, because the Empire's still alive and well.