He possibly was a narcissist simply looking for narcissistic supply. Or let's say high on this particular trait. These people are very successful and are attracted to the limelight and a lot of the times are inspiring as well because in their need to gratify themselves and their values they actually do achieve a great deal of things. However, the close ones may be neglected though, as they no longer posses narcissistic supply and their own needs interfere with the narcissist's pursuit, which pursuit is very selfish in nature. A lot of unsuspecting people are more or less on this spectrum but the fame aspect of them makes them more of assholes to the close friends and family.
Passionate people who get some limelight may steer on this path. Passionate and humble people don't get their dopamine from other's or they do but to a much lesser extent. They don't crave it as much as the former.
All things said, I don't think Feynman should be judged on his moral values, he never claimed he was a priest or a monk, he loved life and gratification. He was inspiring to others and that is what matters.
I found Richard Feynman very inspiring and I still do.
