Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: no good
Review: His approach is getting you to learn the material *by yourself* by doing the problems. It's a nice idea, but when it ultimately falls flat, nothing is explained to you and you haven't learned a thing. Over two semesters, I've spent close to 10 grueling hours a week working his problems - and in the end it's been a waste of my time.
