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

Example Input: This is strictly a tourist rag. Don't waste your time. If your looking for a basic introduction to Voodoo, try Laennec Hurbon's Voodoo: Search for the Spirit; Voodoo & Hoodoo by Jim Haskins; Sallie Anne Glassman's Vodou Visions; Leah Gordon's Book of Vodou or even the Complete Idiots Guide to Voodoo.
Example Output: Negative

Example Input: I don't actually own this album, but I did buy Apple Venus, and I'll say this: I hope that this album has the charm that that album lacked. I've never been so disappointed with an XTC album. Why would one buy an album of the exact same songs, except in demo form? A shoddy attempt to extract money, it seems. Shame on you, XTC!
Example Output: Negative

Example Input: This is the most informative series on Goju Ryu in print. Absolutely a must for all goju-ryu karate-ka.
Example Output:
Positive