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

Let me give you an example: I've read this book with much expectation, it was very boring all through out the book
The answer to this example can be: Negative
Here is why: Review writer does not like the book because it was boring, therefore it is a negative review.

OK. solve this:
This book was recommended by an instructor. I am new to this crazy pursuit of oil painting. My instructor called this her "bible" of color theory, but I honestly didn't understand much of it. Way too detailed, written in language that may be appropriate for someone who has a degree in fine art or art education, but certainly not for a beginner.
Answer:
Negative