Well, this was certainly enjoyable, but not without its faults. When your society is almost more sexist than Westeros, you've got some problems. As it is, I do like how some of the characters are written, particularly the Master Smith towards the end of the book (who acts exactly like an engineer).
I also have a bit of a gripe with how quickly the Dragon Riders manage to cope with four-dimensional thinking. It seems slightly absurd.