Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very disappointing after the excellent job Douglass did with Darkwitch Rising

I found the abrupt shift in focus in this book awkward and unrealistic. While Brutus and Noah's complex relationship drove the first three books, the sudden dismissal (and subsequent marginalization into an ineffective useless and whining character) of Noah and her replacement with her flat and uninteresting daughter Grace was supremely disappointing. Grace's character managed to be an irritating, depthless Mary Sue who's character hijacks and destroys this series previous focus on complex story telling between many vibrant characters and dilutes an otherwise magnificent story into a banal and trite romance.TL;DR Characters are either totally neglected or turned into Mary Sues, I wish I hadn't read this.