Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poorly written

While this book contains useful concepts, the author keeps getting ahead of himself. Every few pages an advanced concept is introduced with the phrase "chapter 6 will cover this in detail, but for now". What follows is a sketchy summary of an advanced concept requiring a full chapter. This is a hopelessly confusing way of organizing material. I either have to jump ahead to chapter 6 to figure out what in the heck the author is talking about and hope I could understand that chapter without reading previous ones (I couldn't), or simply skip it for now and hope it wasn't important (it was). I tried both, and neither method worked.I keep asking myself why other reviewers praise this work. Why does every computer book written in the past couple years have at least 4 1/2 stars? Publishers hire professional reviewers to write glowing reviews. Don't fall for them, or for this book!