Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ray Langston's Back Story Not Believable

Let me start by saying Laurence Fishburn is a wonderful actor. However, his character's back story is simply not believable. Why would a doctor and a college professor whom one would assume is making a good living, leave to take an entry level CSI job? It just doesn't make sense. Then all the other characters are asking his opinion on things; e.g. "Ray, what do you think of this?," Ray, come take a look at this." I find it simply not believable. Rather than attempting to replace a Grissom type character, I would have made Catherine a stronger leader and hired Demore Barnes formerly Hector Williams on the Unit to replace Gary Dourdain's character. I think Mr. Barnes would have been a much better addition to the cast.