The first book of the Inheritance Cycle, Eragon gets a lot of bad reviews. Critics say that it's too derivative of other stories. And a lot of it is true. It's very similar to Star Wars Episode IV - A New Hope. Just put different names to the characters and make it fantasy instead of science fiction. And a lot of ideas are also found in the dragons in Anne McCaffery's Pern series, Tolkien, etc,.
As far as the Star Wars similarities, yeah, they're hard to miss. A lot of it is due to the epic storyline that he's used. The other borrowed ideas are also understandable, since I haven't seen many original ideas in a lot of these dragon/medieval fantasy epic type stories since Lord of the Rings defined the genre. But if you're not looking for a groundbreaking fantasy book, but rather an entertaining read, this book isn't bad. Personally I like the epic storyline books with a young character who gains or discovers magical powers and rises from obscurity as an orphan to save the world. I think it's fun.
No, I don't mind the derivative nature. My only complaint is that the youth of the author shows in the dialog between characters, especially in the beginning of the story. Some of it seems a little contrived or forced. However, by the time you get to the end, you feel like you know the characters and you want more, which is good since there are sequels. And it is nice to read a book without sex, swearing, or other material that I don't enjoy having to take in in order to get through. This book is very safe.
As far as the audiobook goes, the narrator has a British accent, which is pleasant especially for this genre, but he's not as dynamic as Jim Dale. He tends to speak as if every moment was exciting, whether the plot justifies it or not. Don't bother with the movie though. It changed too many important details from the story, skips ahead very fast, and leaves you feeling irritated at the changes and unsatisfied about what was missed.
So on a scale of 1 to 10, 1 being a waste of time to read, five being average, and 10 being the best book ever, I'd give this a six or seven.