Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
One example: I've read this book with much expectation, it was very boring all through out the book
Solution is here: Negative
Explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Now, solve this: I found the politics of this novel interesting enough to disregard the dated scientific references. Seldon and his science was fascinating to behold, and the plot was masterful. What concerned me was (dare I say it?) the fairly amateurish use of dialogue tags and the fact that each character seemed pretty much to speak with the same voice. Asimov wrote this as one of those authors who are at pains not to repeat 'he said'. So it must be a new tag each time, no matter how ridiculous, often paired with an adverb that makes you cringe: ('spluttered angrily', 'cried sternly', 'mumbled grumpily', so on.) Sad this very basic trick of writing lets down passages of vivid description and intriguing plot.Also, some things seemed implausible to me, such as: how was the foundation, which exported its technology across the galaxy, able to keep its technology secret?Nonetheless, this is a series every sci-fi fan has to read - its attributes outweigh its faults by a fair margin.
Solution:
Positive