I would recommend this book as being a more modern-day experiment of the late "Mind Robber" televised story - the only difference being that the fantasy world is an actual planet, where most socioeconomic and cultural life is based on works of fairytale fiction. For example, the nomination of a King/Queen, or Prince/Princess is like the swearing in of a government or presidency.
Still, it was a good book - the comparisons with well-known fairy tales were easy to depict, the Doctor being (in my opinion) sometimes being compared to the manic Baron Munchausen. There were also some morals to be learnt throughout the book (another fairytale concept rule) such as beauty is in the eye of the beholder, etc.
All in all, an enjoyable read.