It'd be fun if this board allowed for tables in posts. XD
Let's compare Goku, Vegeta, Kuririn, the RRA Leadership and Bulma.
Bulma:
- Seeks the dragonballs for either an ideal boyfriend, or a lifetime supply of strawberries. Keeping in mind that she's rich enough that she could probably have gotten either of these without the help of a magical dragon.
- Gets horny at the the mere thought of a hot guy. Oolong, Jackie Chun, Yamcha, 23rd tournament Goku, Vegeta, Zarbon... didn't she think Blue was hot?
- She seemed pretty willing to run off and leave Goku in the Pirate Cave. (But she didn't do this on Namek. Maybe she got nicer by then?

)
Kuririn:
- Didn't he seek martial arts training to pick up chicks?
- Was willing to cheat and use underhanded tactics to win competitions throughout his not-adult-hood.
- While I think offering Roshi porn was playing to Roshi's nature, keeping some of it for himself certainly wasn't.
RRA:
- Used excessive force on innocent people for the purpose of obtaining the Dragonballs, which most people were expecting would be used to attain world domination. Red did all of this, but his goals were to be taller. (Psst: Giant Red as a what-if boss in a game?)
- I'm sure the leaders didn't care about the soldiers that wanted to rape Bulma. Seems like the sort of thing that would have been common and just ignored.
- Hired mercinaries and assassins.
- Condescending toward everyone. Cold-blooded self-serving killers, basically. Children? Wildlife? If they're standing between us and the dragonballs, shoot 'em!
Vegeta:
- Well, he did destroy planets and slaughter billions of lifeforms. Most of them couldn't give him a fight, I'm sure.
- Filler: He had no reason to destroy Arlia.
- He killed his own people when they lost. (Though, I will add that in World War II, the Japanese often killed their own people to prevent the enemy from having that chance.)
- He sought the dragonballs to gain immortality... though his reasoning was to defeat Freeza, who is hard to argue as being anything but more evil than Vegeta.
- Did I mention needless slaughter? Vegeta was strong enough to get what he wanted without killing Namekians. Granted, he had valid strategic reasons to kill Freeza's minions. But still...!
- His banging Bulma isn't elaborated on enough to pass judgment, but it seems rather spur of the moment to me.
Goku:
- After the DBs usually for self-betterment. Never has a use for them in mind, just wants the one that Grandpa Gohan found fairly and left as a keepsake.
- He only ever killed people that were trying to kill other people, and animals that he needed for food.
- Goku's sexlife is left ambiguous, but given his general lack of experience with the subject and his relationship with ChiChi, and the fact that there are only two kids, spaced about nine or ten years apart... it's rather safe to say he was less frivolous with it than everyone above.
- He did quite a few selfish things for the sake of getting to fight. These sorts of things only reached the level that I'd question the purity of in the later series, though. If anything, this shows that Goku has negative character development over the course of the series.
So, what'd I miss?