In thinking abut what the average golfer wants (and why), I'm certain that without the risk of a punch in the mouth you don't have a very good golf course (and you'd have a terrible boxing match). I'd go so far to say that the risk of a punch in the mouth has to be there on every hole (i.e. just like in every round). But what kind of punch is the thing. Jabs are good, right hand uppercuts maybe not so much. I think many of us would much rather fight Sugar Ray Leonard with 10 oz gloves than Mike Tyson using 6 ounces; 99.9% of us would still get beat, but at least we wouldn't get killed! But on the other hand, maybe I'm wrong about that too: Mark B obviously loves Yale (as others love Oakmont and Muirfield) even though they are rocked off their feet -- and their plans go out the window -- with the very first punch.
Muhammad Ali would be a "10" as a golf course, at least for the skilled golfer; so too would Sugar Ray Robinson. I think Rocky Marciano and Joe Louis might be "9s" (for those who like an Oakmont experience). I'm not sure I'd want to play Roberto Duran or Thomas Hearn -- not heavyweights, but tough as nails and unrelenting.