I've watched JP's lectures before he became popular. They used to be shown on TVO (Ontario public TV). I even attended some of his lectures at UofT. They are really, really good. It's not some typical self-help stuff that people think he's marketing nowadays. Really goes into the fundamentals of human psychology, behavior, culture, religion, etc. He even changed my mind on religions and made me a strong believer of existentialism.
My favorite rule: "Don't lie". You realize that it's not just about lying but it's about living the best life possible. You end up keeping your actions in check because you don't want to lie about them. For instance, you wouldn't do any debauchery things because you'd have to lie about them to your wife. So simple yet it really sets you straight.
Unfortunately, he has now been politicized and therefore has become a polarized figure. It's rather unfortunate.