Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The most poorly written book I've ever read.

This book is a major waste of time and money. It is very obviously self-published, no one else would put out something so packed with incomplete thoughts, spelling errors, grammatical problems, or a total lack of new insights or anything of value to add to what's already been written. I'm sure Mr. Nelson has a point (or two), but after reading his book, I'm still not sure what it is.