No nerd rage here. Your perception of Superman as so overpowered as to be uninteresting is simply far too common today amongst young people to incite any particular feelings of vengeance against you specifically.
The point of a Superman story isn't to improve the protagonist. The point of a Superman story is to make the kid in all of us think, "wow, it'd be so neat to be able to do that". The point of a Superman story is to see the wrongs get made right. It's to see the bad guy get his comeuppance, and cheer for the hero who saves so many, asking for nothing in return but to be allowed to live in peace, faced with a world that by all rights could easily reject him, wanting him to leave humanity alone. Some might feel people would be better off failing on their own than be rescued when the going gets really tough? After all, without him, humans would still get by. But look at it this way... when he *does* save people, isn't that still a good thing? The point is not for humanity to always depend on Superman to always save the day, but to simply be glad that he somehow always does.
The notion that he is somehow the very "personification of good", as you call it, is not inherently part of what Superman is, it comes forward because he was raised by down-to-earth human beings with good character who were also willing to instill good values into their adopted son. Somehow, some way that is never really explained, nor can I expect it ever be, young Clark resisted the temptation that almost certainly would certainly take any one of us, and never became absolutely corrupted with the possessing of such power. Maybe because as an alien he also possessed a greater amount of restraint than what humans necessarily have, I dunno. And I'll admit that's probably the hardest thing about the character to ever relate to. Regardless, I don't think explaining it would make a good Superman story.
But Superman still loves, laughs, grieves, and can experience pain, even if not necessarily physical. And that, I think, makes him just as human as anyone.