He's an asshole. Ferrigno was a tremendous athlete--hell, the dood is still in shape--and his training advice is solid, if not revolutionary. But poor Lou spends too much time bitching about life and what might have been. He writes ridiculous statements such as, "I could have won the Olympia if I hadn't retired." That's kind of like me saying I could have been the world's greatest concert pianist, had I ever taken up the piano.
Lou ultimately never had what it took to make it to the top, competitively. He never reached the summit at his peak in the 1970s, or when he returned to the sport in the Masters division. Instead of accepting his limitations and turning them into something motivational, he tends to blame others for his failures. Thus, instead of being an inspiring book, his "Guide..." winds up being irritating.
It didn't help that when I met him for the first time--a lifelong dream--he stuck his hand in front of my camera and said, "No pictures," then wanted to charge me $20 for a picture of him taken with my own camera! He's been referred to as "the Incredible Jerk," and my own experiences with the man certainly validate that title.