Goku is maybe a little to powerfull, because of his spiritbomb, and kamehameha, but the one who is really to strong, is
Buu he has very high health, can regenerate, and can change you into a candy, 1
onut, the Donut make's you 1000 PL higher!
2:Chocolate, this makes your energy to full and finally 3:Cookie, this makes your health back to normal,
Now tell me, wo is stronger? buu or kakkarot/goku?
And vegeta is way to weak, in the show his gallitgun is as powerfull as the kamehameha!, he could destroy a whole planet with it!
And the kienzen of krillen is also a nuisance, that one of freeza to!