Instruct: Classify Amazon reviews into positive or negative sentiment
Query: a disappointing muddle

A brief introduction to a great thinker should be clear, systematic, and fluent. Unfortunately, this book fails badly in all three respects. The prose is turgid and the ideas are very badly explained - I came away frustrated by the fundamental lack of clarity. The editor of this series was asleep at the wheel on this one - this book cries out for an editor's red pencil.