Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't purchase

These DVD series mean well and try to even make the topics that they teach interesting, however, be forwarned, their style is to interject a lot of tangentially related jokes. Not only are these jokes not funny...they detract from the material that they are trying to teach in the first place. There is a lot of empirical evidence that show that students that learn with material loaded with a lot of seemingly related, humorous details...remember only those details and not the details of what they are suppose to learn.