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.

Q: This was a bad buy. It did not work properly and I am very disappointed with it. Not good customer service. After hours of troubleshooting we realized the unit needs to be returned for replacement. Hopefully it will end up working properly.

A: Bad review
****
Q: The product works, but at no level is it particularly good to have or extremely bad as many other reviewers seem to be saying. It does look great, and feels nice, the material seems very sturdy, and even with a full charge, has sufficient battery life to last for hours of usage. BUT.

A: Bad review
****
Q: This book goes against every principle of sound finance and economic theory. The author does not even attempt to provide sound statistical information. Her "corrects" are based on a highly questionable statistical analysis from her own previous work with the IRS. If you want basic financial history, there might be something in this book. Otherwise, pass it up. It's a shame that many people will buy into this. I'm an attorney practicing real estate law, but I would rather use my time studying the principles she outlines.

A:
Bad review
****