Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Petery Selby & Steve Slavin, great @ math, bad @ teaching

I normally only review a book if it is either completely outstanding, or frustratingly awful. This book is the latter and I am shocked at the 5 star reviews. Much like the author's other book "all the math you need", this one is lacking in so many places. If the author were a swimming instructor, he would briefly explain to you how to do the backstroke, then immediately grab you by the belt loop and throw you in the deep end fully expecting you to swim. The practice problems at the end of each explanation go googles beyond anything that was explained. This leaves you frustrated and confused at ever turn. I've fortunately found some excellent resources on the web that fully explains every concept covered in this book. There's no doubt that the author knows the subject and it was a noble effort to attempt a book, but some people have no business attempting to cross over into the teaching business and this is a prime example of just that.