Many "making of" shows him as a very very respectful and friendly (right amount of goof on set) person. His words about body building are also not shallow, he talks about the dedication and the inner exploration about your own limits. It resonnated with ideas I had in other fields that are much less "dumb" in the public eye.

ps: he's also directly responsible for movies like Total Recall, which were burried for years, and he arranged financial and directorial setups for it to happen because he loved the script and the filmmaker. I've heard it for other movies but my memory is in DDoS right now.