I suppose the highest accolade to offer this book is that I didn't remember to be sad that this is the last DWJ book EVER until I finished it.
Also, the nice thing about DWJ (and Ursula it seems) is that she is very consistent in the intricacies of her plot structure, but always manages to take those intricacies to new and exciting settings and people and...I'm going to have to reread the castle books now.