@captain13: Superman was never really completely motivated by his dead parents. He was interested in his Krypton heritage and all that, but a lot of it was because he wanted to put his powers towards the betterment of humanity.
Batman was dead parents.
Robin was dead parents.
Wonder Woman was never about dead parents.
Green Lantern was only dead parents when it came to his job at Ferris Aircraft.
The Flash's dead parent and convicted father only gave him motivation when it came to being a police scientist.
Aquaman was never motivated by his dead parents.
Martian Manhunter was a mix of wanting to put his powers to good use for his new home, planet Earth, and his child and wife that died.
Cyborg's parents are still alive.
Green Arrow was never motivated by the death of his parents either.