Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very disappointing.

I regularly read great articles from the subscription program of HBR and rely on its contents for great insight into today's business environment.Unfortunately, the HBR book series make a poor comparison. I have even wonder if HBR is recycling unused, or rejected submissions for these books.I bought Managing People, Brand managment and Marketing and stopped reading each after just two articles. They were just all a waste of time.