I have read all the books in this series and enjoyed them all immensely. They are refreshingly different in that the story does not revolve around human characters interacting with dragons - it is all told from the dragons' point of view. Having said that, the dragons are very anthropomorphic, thinking and behaving like people rather than animals (they have such concepts as murder, government and war), but the characterization is very good.
The plot is complex and interesting with rarely a dull moment, keeping you gripped all the way through.
The only complaint I have is that, as any cryptozoologist will tell you, the author's "natural dragons", having only two legs, are in fact not dragons but wyverns!