He's not Superman but he had nobility.
You know what the difference between Homer Simpson and Peter Griffin is? Homer gives a shit about his family, even the boy. The entire plot of the Simpsons movie is Homer fucking up and then moving heaven and earth to set things right, something Peter would never do. Z and GT Goku, especially GT Goku, is the same kinda lazy guy who wants to fight and train but when it came down to it, was willing to move heaven and earth (literally sometimes) to save his family and friends. Super Goku wouldn't give a fuck if it meant getting a good fight out of it.