Right after an entertaining but bloody and lucky-victory battle against a giant chunk of Durza's army, Eragon decides to follow Arya to Ellesmera to learn his full potential as a dragon rider in extra training. It may be hard for him to keep his hopes up after a surprise attack and slaughter, and when he gets there, he has to try to compensate in life, going through the fact that beating Durza was pretty much luck with help and trying to take time off of meat eating. None of this is very interesting to me. Meanwhile, Eragon's cousin, Roran, who kind of disappeared after he left in the first book, is back, trying to defend Carvahall as the leader of the rebellion against the Ra'zac, whilst trying to have enough time for Katrina. Nasuada is also planning some Galbatorix fights, but going into weird territory involving lace.
Christopher Paolini is a very patient author who seems to love fantasy as much as Jane Austen loves, well, pride and prejudice. He even invented a language. But this sequel just isn't as exciting or mind-blowing as the first one when Eragon was practicing magic for the first time, had limits, and bonded with Saphira. A few characters are murdered right at the start, which I think weren't put in the first book because it would make a reader lose a bit of interest and not check out Book 2. This isn't a terrible book, and the training isn't too boring or brutal. It just leads to a fight at Surda, reading the book pretty much only to wait for it, but this book doesn't have a sweet ending and leads you straight to Book 3. After you read this chapter, think about how much you are interested in Eragon's story, then decide if it's worth another long road.