Not familiar with it at all, can't comment (would like to read it though).
Which example? All-Star or Sandman? Because if you haven't read All-Star, then you really should. I think it should be required reading for discussion of Superman's power level.
Being a compelling character is just not the same as being a compelling protagonist. There are a multitude of compelling and fantastic characters in comics that cannot carry a story on there own for the simple fact that they lack any capability to be relatable to the reader/audience, two examples of which being Joker and Galactus.
Yes, you already said that. Your argument, though, basically amounts to "This is the way it is," and you haven't provided any argument that convinces me my assessment is in error. As I already wrote, not every protagonist is supposed to be relatable, not every story is supposed to be relatable. Some ideas, some characters, and some stories are bigger than that.
As for the Joker and Galactus, I challenge your assertion that they cannot be effectual protagonists (though it may be true of the Joker; I question whether anyone can get behind a character with absolutely no redeeming qualities); they merely have not been used as such yet. Perhaps because there's no particular need (though personally, I would kill for a Galactus mini-series or graphic novel), or perhaps because no one is up to the challenge.
You claimed in an earlier post that not every character has to be relatable in order to be compelling....and then cited examples of superman dealing with conflicts that make him relatable.
I'm not aware of citing any such example, unless you consider tackling moral decisions on the scale that Superman does as "relatable," which I do not. Having a hard time find a job is relatable, having marital troubles is relatable--deciding the fate of the world is not.
It's possible we're not talking about relatability on the same scale. For clarity, and as I've said before, I'm not suggesting Superman shouldn't have humanity or face conflicts we don't understand--but, again, Superman's humanity isn't the same as our,s because it's
super. His problems are bigger than ours.
The truth is.....I find myself very conflicted about the appropriate characterization of Superman sometimes. For an extremely long time I have felt that Superman should return to his status as the uncompromising hero of modern myth he was meant to be.
The problem is, I'm coming to believe that this will be the death of Superman as a leading character outside of comics.
Why?
You just outlined the problem though.
Digging down deep to find strength inside that you didn't know you had may very well be the most cliché story telling device in history...but it's cliché for a reason; it works and it's extremely dramatic. I'm sorry...but you just plain cannot beat a character struggling with every fiber of his being to will something to happen he's not even sure he's capable of; or at least certainly not with ok take it easy...don't over-exert yourself, you'll split the thing in two if your not careful....nice and easy....just relax and keep er balanced....
I absolutely do not agree with this, and I think that's a defeatist attitude. Fortunately, there is a lot more to dramatic conflict then characters performing
limitbreaks. That's not to say Superman should not be tested; but I will happily sacrifice a few "Oh no, is he strong enough--oh, I guess he is" moments if it means have more interesting struggles and storytelling.
Superman has always been the most interesting to me when treated as high concept, not another superhero trying to hit people
harder than ever. Absolutely, there is a place for that in the genre, but that's not really what I'm reading Superman for. I'm more interested in seeing the guy who spends a thousand years building an artificial heart for the sun, who has to endure emotional hardships no mortal man could conceive, and deals with struggles on a scale we can only imagine.