Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This book is not good

Actually I purchased this book few months back. Today my opinion is this book is not upto the mark. It is only blah blah blah. No topic is covered in detail. I needed to search web for many things after reading this book. He is nowhere discussing crystal reports SDKs in detail. We wont get any overview of crystal reports SDKs provided with visual studio.