Is there a lot to learn from him? His amorality has left his reputation in tatters. Yes he earned some money but at what cost? Is being a reviled shadowy billionaire really worthy of praise or respect?
This is far more important than this vague idea of reputation. Just because a person has a good reputation doesn't mean they are respected or loved. It could just be that they do not figure at all in people's minds. You can live up to people's expectations and die having never really lived.
Honestly it's somewhat reflective of the infamous slave morality vs. master morality debate