Boromir - An example of a man?

[Inziladun]

Originally Posted by Tuor in Gondolin

Would Bard's
grandson Bard II have used the Ring? Very likely when the Lonely Mountain
was besieged, although perhaps temporarily advised against it by the nearby
ally elves. And no, I haven't seen PJ's latest assault on The Hobbit. The first
was enough.

I think it's clear that anyone possessing the One Ring would be ultimately be unable to resist claiming and using it sooner or later. Those with great power (Gandalf) or ambition (Boromir) were just especially vulnerable. A Bard or Barliman Butterbur might hold out longer, but probably still wouldn't do as well as a Hobbit.