Given an English language product review, determine if it is a Good Review or a Bad Review. A good review is one where the product's review has positive tone and Bad review is one where the tone of product's review is negative.

[EX Q]: I'm not going to bother commenting on the content of this DVD, because even I feel it is an insult with all the errors and factual mistakes. First the most annoying error -- he has a group sitting in one room talking about the Holocaust without noting that almost every person who ever worked for or was persecuted by Nazis was Jewish, making no distinctions at all: they were all Jews.
[EX A]: Bad review

[EX Q]: I haven't done any serious studying for my exam. This will be the first time I've ever sat at a exam after watching a TV show and looking all over this book before I go into each section, trying to find anything. I can almost get through it...
[EX A]: Bad review

[EX Q]: Purchased one and it worked ok for a month of normal use. About 3 months after the purchase, though, the mouse button ceased to function. Contacted Amazon customer service as instructed by Logitech, who were extremely accommodating - I explained that while my product was still under warranty they could send me new one, however it would have to come directly through Logitech. Got this replacement mouse, just to find out two weeks later it's also not working.
[EX A]:
Bad review