I don't see anything in the Wikipedia article that implies he was a borderline scam artist. Even the "controversies" section only really talks about the fact that he used steroids in the past and something about Amazon reviews for his books.

I'm not necessarily saying you're wrong... but what has he done that's actually bad? He says himself that the things he writes about worked for him, and he shows how he measured it in his own life. That doesn't mean it's scientific fact and will work for everyone necessarily.