Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This book is poorly written.

This book is so very poorly written and I only gave it 1 star because there weren't selections for zero or negative stars. Everything that is written in this book about Silverstream is common knowledge and is contained within the Silverstream manuals, and on-line help. The book is completely worthless, and the authors are trying to pull a fast one on you by selling you this book.