Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Fun to read

In praise of Crichton's new book, I can say that it was fun to read, but not much else. It's very obvious from the writing that he did quite a bit of research into the Middle Ages, but there's very little that would be new information to anyone who's taken any European history course. The quantum theory he uses to justify what is essentially a form of time travel is based in fact, but fantastic descriptions littered with meaningless jargon place the process well outside the boundary of reality. The plot devices he uses are old and threadbare, and the characters are stereotypical to an absurd degree. He did keep the plot moving, however, and taken as nothing more than a typical action book, it was a decent read.