Superman is one of the original comic book superstars, and he set the standard for superheroes to come with both his array of mysterious powers and his strict moral code.
Ironically these crucial character elements caused his storylines to become stagnant, because seeing him win or act like a golden boy for the millionth time just isn't very fun to read.
What is fun to read is the story of young Private Atticus Kent of the Union Army, who discovered he was Superman after being shot with a cannonball, or seeing Kal-El become a force for Communism because he landed in Russia instead of the U.S.
Superman's family history is another element the writers like to mess with, because a minor tweak can make a major difference to who Kal-El becomes.
Imagine how different Superman's story would have been if his parents hadn't died on Krypton, or on a darker timeline imagine how strange it would be to see Kal-El as Darkseid's adopted son.
It only lasted for one issue before he betrayed Darkseid and became the hero he was meant to be, but still far more interesting to read about than the standard Man of Steel!