Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Great coach - dissapointing book

I loved Gruden when he was with the Raiders - a great coach, a terrific leader, and massively fun to watch. His book, however, is rather dissapointing. Not because he's a bad guy - quite the opposite. He is so reserved in his criticism that the whole book comes off like some sort of "Wonderful Life." For example, when talking about Ricky Watters (a player who was obviously a major pain in the a**), he says merely "For whatever reason, Ricky Watters never really seemed to warm up to me." And his dodging around Al Davis is even worse - his summary of why he left the Raiders is simply "My agent, Bob LaMonte, told me that negotiations for a contract extension were going nowhere." That's it???Great guy, great coach, but a dissapointing read.