I'm glad to have FINALLY finished the Inheritance Saga, but I felt like there were too many gaping holes left in the end. (view spoiler)[I'm thrilled Roran and Katrina have their happy ending (Roran was always one of my favorites). Also, I'm okay with Arya becoming both queen and a Rider (I always expected one or the other, but I'm fine with both achievements). Also, the changes to the magic to allow dwarves and Urgals to become Riders are welcome. The things that really bother me plot holes in character development as well as Paolini's still underdeveloped writing style. 
 First, Elva is one of the most terrible characters ever. Sure, Eragon messed up, but he was young and he has done all he has to make her comfortable. However, I feel like if there is any sort of spin-off, it'll probably be because she's trying to take over Alagasia. 
 Murtagh is frustrating because he goes through a massive change of character with hardly any comment and then he just leaves. That's not an acceptable description of development; that's lazy writing. 
 Angela is likewise given several small mentions throughout the novel, but the only comment worth anything is the apology Paolini gives at the end of the novel. "If I answered your questions, she wouldn't be mysterious" is also just lazy writing. 
 And the final issue I have with Inheritance is the biggest: The first 600-ish pages (at least the pages until the battle in Uru'baen, I don't remember exactly where) are so greatly detailed about the battles, the events, the very passage of time. Then, suddenly, everything becomes 2-ish days later, several months later, a vague amount of time later. It's fine if that were the style of the first part of the book, but it was not. The sudden change (even though there was a massive change from Galbatorix's empire to the free empire under Nasuada) was disorienting and made the last hundred pages very difficult to read. (hide spoiler)] 
 That being said (and I know I'm being harsh), I very much enjoyed the world Paolini created, even the "borrowed" elements. I grew to care for these characters (which is why I wanted more for them) and to care about their troubles. I hope Paolini does revisit Alagasea one day (if only to tell me what happened to (view spoiler)[the dang Belt of Beloth the Wise! (hide spoiler)]), but I feel like he needs to mature his writing. I feel like if he'd waited to publish all four novels, they would have been more complete and also because that horrible movie wouldn't have happened. :P 
 I recommend this to: people who have read the other books and want to finish the Saga. 
 I don't recommend this to: people who are Tolkien purists or who have not read the first three novels