Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Oversold and Underdelivered

I am a martial arts instructor who is wanting to incorporate some basic Brazilian Jiu-Jitsu into my curriculum for self-defense purposes. After reading all of the glowing reviews about this book and DVD being "straight and to the point" and how Simco just shows the street-effective techniques I thought this would be the right resource to utilize.I was wrong.I am very disappointed in the skimpy material in this book, all of which is designed for use by a very strong fighter in an MMA competition, not a normal sized individual on the street. Also, the DVD is nothing more than an advertisement for his other DVD sets. Seriously, there are only 3 techniques on the DVD (about 10 minutes worth) and the rest is previews without instruction for his other products.The techniques he does show are good if you are an MMA fighter, though there are not a lot of them. If you are looking for a self-defense book, I suggest buying something else.