This superhero has been around the world for about 70 years or so,he's been an idol even outside the comics and has influenced living people,heck you can go around the world and ask litteraly everybody even old folks who superman is,even if they never saw a comic in their life.
Many complain about Superman being too good and too powerfull but he is not suppose to be related to us so why do we try to relate to him?
We were not suppose to understand him anyway since he sees the world different than us and of couse he is suppose to be that powerfull since he is representing the endless potential imaginable.
Over the years Superman has done it all,by having different incarnations and stories,he has been good and bad also he's changed from invincible to a superhero with weakness to apeal the fans.
Really I do not understand what is with people,.first they complain that Superman is too powerfull and then that he is a weakling who can't do anything and useless.
Some people will never be pleased no matter how much you change the character
However this character is the greatest one since no one character can leave a legacy like he did even outside the comics.
It doesn't matter how many changes he will go throught,the spirit of Superman will always be the same.