It's not about being "Superman."
Quite frankly, I don't enjoy getting hit with paintballs, and am not about to volunteer to get hit with any sort of shot; rock salt; whatever.
However, if I want to stop a person, I want decent odds of a physiological stop, not just a psychological stop. There are people out there who deal with pain better than most.
The problem with hoping for a psychological stop is that things can develop in unintended ways. Pain can cause one to flee (and often will), but there are two standard possibilities when the body kicks into "fight or flight" mode. (Note that one of them is not "flight.")
From personal experience, in hand to hand scenarios (on and off the mat), I know there's a fine line between "Ow, that hurts, I think I'll tap out now," and "Sonuva!!! That hurt!!... It's payback time!!!." If level 2 gets achieved, watch out, until enough power is brought to achieve a physiological stop.
With regard to this discussion, the question then becomes this:
Given similar (or less) weight and overall bulk, am I better off with a Judge, with five rounds of radically reduced shot loads, five weak slug loads, or five .45LC which might or might not be usefully accurate; or am I better off with, say, my FNX-9 with 18 rounds of Hornady 147gr TAP, which will reliably expand to .55 or so while penetrating 14"? Note: recoil in the FNX is minimal, the trigger is easy, and keeping all shots from a 50rd box in the triangle between center of the mouth and the pupils of both eyes is relatively easy at 7 yards. (Not on a moving target, of course, but just for relative accuracy comparison.)
Staying in the similar size and weight category, I could toss in an FNX-40 with 15 rounds of .40; my DW CBOB .45acp; any of my revolvers... you get the idea.
Would I want to have somebody shoot at me with a Judge loaded with birdshot? No.
But given a choice between somebody firing that at me, or somebody shooting a normal SD handgun at me, I'd opt for the Judge every day of the week. Odds of survival would be higher. It would suck, but odds are it would not suck as much as getting shot at with a 9mm, .40, .45, etc.