Instruct: Classify the given review into positive or negative sentiment.
Query: Most Useless SAP Book I've Ever Seen

I bought this book to serve as a good general overview of the SAP modules for some co-workers who are new to SAP. It fails to do that, and I would have certainly been in trouble if I had needed this as a certification study guide.The book lacks clarity, is repetitious, and has many grammatical errors.