Most people that comment negatively on Krav Maga have not even tried it, not even for an hour. One of the biggest things that determines who wins a fight is their conditioning and how good a shape they're in. That's one huge thing that KM does - it gets you in shape. I've seen too many McDojo 'senseis' that have huge beer bellies...meaning they couldn't last 30 seconds in a real fight. The KM teacher I trained under was close to 50 years old and was fit as a fiddly, six pack stomach that he got from doing KM and was in better shape than most 20 year olds. In another 'style' I lasted 5 weeks, then quit because too much secret ninja stuff in there...for the entire 5 weeks we were practicing the 17 ways to get out of when someone tries to grab your wrist...we were on number 5 at the end of the five weeks. I guess when you learned the 17, you got your black belt, I don't know. Both new black belts had huge beer bellies and looked like the only exercise they got was running to the frig. Usually, most classes, we also practiced some George Dillman secret move that was designed to impress us. Just saying...