In short, Goku is pretty much the typical one-dimensional character from Japanese media who lacks the ability to outsmart his opponents in combat. At least with Dragonball, as a child, he actually served more of a significant purpose of wanting to learn and his fighting prowess reflects that. But, with the addition of him expanding his story into being an alien from another planet, where they could be synonymous of homosexual erectus, his character was less of a character that people could really relate to, even with his strong tenacity to become the best.
He is extremely powerful, especially with the recent (and fairly decent) Dragon Ball Super, thanks to his "god" level form, but still lacking any real sense of character development.
And you'd be correct. Superman, like many Western comic superheroes, do serve more as a symbol of something deep that we all should strive to become. With Superman, it's hope. He's pretty much the
primus inter pares and a lot of people do revere him, despite being an all-powerful being who has actually broken through his own limitations. He's not about becoming the best, but rather, his story is a god trying to live amongst men. That and find a balance between home vs. heritage, what his fosters parents taught him a sense of morality, and his Kryptonian family via holographic imagery and how he should be able to use his powers for good.
A lot of naysayers often come off as sophomoric for their disdain for old school heroes like that and would often go to characters that are generally flawed and relate-able, like the Marvel comics characters, where their world is crippled with problems, while they struggle with their own demons and how to live in a world of chaos while finding a sense of purpose with their abilities and skills. The Punisher serves as a reminder as to sometimes justice have to be enacted if the authorities cannot do it.
Kal-El, as Jerome Seigel and Joe Shuster gave Superman's Kryptonian name from an ancient Hebrew name meaning "All that God is."
I don't think that Superman ever had a God complex except when it was for the good of everyone involved. He might judge a person from their own deeds but he doesn't pass judgement on anyone. Superman is very well aware that there are forces out in space and perhaps on Earth that could kill him(remember Darksied and Doomsday or anyone who has some Kryptonite in their possession).
Superman set the standard for many superheroes and he leads by example. Like everyone else, he has his problems; magic, inability to see through lead, taking a life, protecting the lives of those closest to him, mind control, etc. All the other superheroes are faced with almost the same issues after realizing and using their abilities.
Frank Castle, The Punisher is a very extreme example of the Warrior Class. Well trained and very well armed. His motivation is to kill all wrong doers and will let nothing and no one get in his way.
As for Dragon Ball Z's Goku, I guess he's an episodeextremely powerful being. However, I never got into Dragon Ball Z. But I will take your word for it.
