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

I immensely enjoy time travel genre, and Mr. Steele Gray carries off the concept fairly plausibly. However, the book in general lacks rich descriptions of the prehistoric time into which the hero is stranded. Mark, the hero, never really encounters any serious danger through out the entire book, making the book rather unexciting. Compared to Diana Gabaldon's "Outlander", another time travel novel, "Survivor" was flat and uncomplicated.