Given the task definition and input, reply with output. 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.

The book could not be worse. Its content is weak and the English used is difficult to understand even for a native speaker. I would never recommend this book. It was actually painful on many different levels. If you bought it online, return it!
Bad review