Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

"Castle" is a wonderful book for children who have short attention spans. It provides adventure and re-affirms the laws of chivalry.
Positive

As a student of jiujitsu i understood alot of the moves but i found that without previous knowledge these pictures and instructions were difficult to understand. I feel there is alot of good information but not worth buying.
Negative

Why would I choose to listen to this when I already own every Black Sabbath album, and every Blue Chear album? I mean-it sounds like a cover band pretty much. But they will fare well in a music industry that does not favor creativity over a fashionable rehash. Such is life.

Negative