Instruct: Classify Amazon reviews into positive or negative sentiment
Query: TERRIBLE

This is the worst text I have ever had to use. There is no cohesion - Chapter one, for example, provides not enough information on too many topics - and I suspect some of the exercises are erroneous. Either that, or they just don't supply you with enough information to answer their own questions. It is not easily understood either; they do not provide the reader with sufficient examples to illustrate their meanings.