Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not bad

While this is definitly an informative book, it is more of a reference book as opposed to a book which will teach you the language with little or no Russian background. If you're already a student in Russian, this would make a good supplemtent to your studies. It is nice to have for a quick reference in the confusing or more subtle points of Russian grammar. However, if you have no background in Russian, I doubt that this book would be a good starting point.