Instruct: Classify an Amazon review into positive or negative sentiment.
Query: A real disappointment

An admiring though shallow and poorly written account of a unique American genius. Though salted with several good anecdotes, Gordon's book mostly relies on the research and interviews of others and ultimately does little to explain McKinley Morganfield's life and times. For a writer who presumes to account for the life of a musician, Gordon's descriptions of various Waters recordings are especially poor. Far far better is his video documentary of the same name. One suspects the book is the assembled notes of that project.