An awful and tedious perversion of the Oz story. I can think of nothing to recommend it: the writing is ostentations, the characters are ridiculously unbelievable, the plot is both boring but also beyond belief and contradictory to Oz.
The whole idea is telling the story of the Wicked Witch of the West. However, if one is going to write a book using the characters, setting, AND plot from another novel, one ought to follow the rules set by the previous author. Wicked takes the wonderful world of Oz and its rich characters, and turns it/them into a soap opera complete with useless drama, pointless sex & perversions, cardboard characters who don’t act like normal–or even abnormal–humans, sophomoric moralizing, etc. etc.
This is a best-seller, and I can’t for the life of me figure out why. There can’t be that many people who hate the Oz books so much they’d like to see them destroyed like this.