Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not as good as Heinlein - better!

While the steady stream of interesting and entertaining ideas in this book is reminiscent of Heinlein, the quality of the writing surpasses all but the very best of Heinlein's novels. On the strength of this book alone, I'm adding Scalzi to my list of must-buy authors. The setting, the plot and the character development are all first-class. Highly recommended.