Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dr. Cook, please return to the hospital!

What a stinker. Having read many of Robin Cook's previous medical mystery novels, I felt suckered after I bought and read this one. It is a sci-fi attempt by an author way out of his genre. This stuff has all been done before by real sci-fi writers, and Dr. Cook's attempt comes out at the level a 6th grader might enjoy. When I buy Tom Clancy, I don't expect poetry. When I buy Robin Cook, I don't expect a preachy Greenpeace advertisement. Dr. Cook, return to the operating room, STAT!