Mentzer had a good physique but was not quite what people paint him to be. He was purported to be an intellectual but when you read his writings you see that he was quite myopic, simplistic, and closed-minded in his thoughts which is an indication that he was not quite as intelligent as many people think. He also had many problems in his life from what I have read to include the abuse of stimulants and bouts with depression and or some form of insanity.
That said, I always enjoyed his writings and liked his training style.