Monzon outside of the ring?

Probably a career-ending whupping:good.

 

Beautifully put:yep:good.

 

Norton is not overrated. He deserves credit for performing as he did against Ali, and should be remembered as one of the best heavyweights of that era. Anything above and beyond that would be overrating, but I don't see that.
Duran above 135 is probably overrated by some, he's got such an enthusiastic following, some of whom make excuses for his patchy record at those higher weights.

As for Monzon outside of the ring, he was probably quite evil.

 

Monzon sounds by definition a psychopath, not a just a regular crazy person that people call a psychopath because they've never educated himself.
As for Duran I'd say he fought many good fighters throughout his career so that's why he has a handful of losses. He had the courage to put his record on the line against many good fighters, when someone does that they're bound to have a number of losses just like Robinson, Pep, and Greb.