Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Opportunistic blahblah in Oprah Winfrey style

This book from the so called 'mangement guru' Hamel lost all its standing when the Enron debacle emerged. mr Hamel has used Enron as worldclass example and innovative company. What a nonsense. Second, you need to know that this writer was in the Chairman advisory board of Enron.Where is your credibility as management expert with making such enormous mistakes ?!On top of that Hamel is trying to hide his past with Enron. The quoted flaptext of the book on his website does not mention Enron anymore. But, he forgot that it ist still in the flaptext in the printed book.Do not spend money on a would-be-guru who thought he was right and now is trying to hide his past after finding out he was dead wrong.