This book isn't amazing, but it is certainly the best in the Inheritance Cycle. I think that if Paolini had spent a bit more time on this, it would have been better. For the most part, Paolini shows off his extensive vocabulary and descriptive writing effectively, but there are areas, as a reviewer before me pointed out, where the writing is very awkward, and it seems as if a younger person had written it.
Without those areas, and of course the extremely dull bit about the Dwarven politics, this had the potential to be a really good book. I actually found the beginning quarter of the book much better than the remainder of it.
It's still worth a read, especially for fans of this series, just don't expect to be blown away.