I found the "Monster High" web cartoons online to be quite cute, with vivid & distinct characters and a fun setting. When I heard about this book, I was excited to see this world explored in the depths that only prose can really reach.
Boy, was I disappointed.
Lisi Harrison apparently took her notes for an unpublished "Clique" novel and forced them into the Monster High concept. The fun, vivid characters from the web cartoons are replaced with flat characters who do everything possible to hide what makes them visually interesting, including whiteface (which is all sorts of wrong). The only new additions Harrison brings are more castaways from the "Clique", and we get our requisite love triangle, since any book series aimed at women MUST force in a romance by law. The love triangle is the only place where Harrison shows any sort of creativity, since it's a twist on Jekyll & Hyde, but other than that, she seems more concerned with dropping as many designer & brand names as possible than actually writing an interesting story. In the hands of a writer whose imagination isn't limited to whatever fashion rag she most recently read, this couldn've been a good book, but Harrison apparently can only write what she sees on Style Network, not actual characters.
Mattel gave Harrison a wonderful, imaginative world to work with, and she threw all that away for a whitewashed pretty-people festival, just like all of her own series. Why an author so devoid of any true imagination was given this series, let alone is popular, is beyond me. Avoid this if you have any respect for writing as a craft or even just for using your imagination beyond picturing yourself in the latest issue of "Seventeen".