Death Battle2010

Wizard:
We cannot judge Goku by his power level, nor can we through power scaling, the theory that he can achieve the same feats as lesser Dragonball characters. Goku's abilities are tailored to his personal training and experiences, not to mention anatomy.

Boomstick:
However, Goku does have a knack for mimicking ki techniques.

Wizard:
Ki is metaphysical, made up of things such as vigor, courage, and being in one's true mind.

Boomstick:
It's basically a kind of natural life force energy and is a fundamental component of Daoist medicine and martial arts. Oh, and uh, it's NOT magic.

Wizard:
Dragonball creates a very distinct difference between ki and magic. Ki is dependent on the physical ability of the user, and magic-users like Babidi are clearly using something different. Goku harnesses and manipulates his ki energy...

Boomstick:
Into badass lasers and stuff, like ki blasts, energy barriers and the Destructo Disc, which he totally stole from Krillin. The Solar Flare blinds opponents and the Spirit Bomb puts energy from other things into a giant death ball... that takes freaking forever to make.

Wizard:
And energy taken from sentient beings must be voluntary. The Spirit Bomb is fueled by positive energy which is only effective against those filled with negative energy, AKA evil. In the Super Android 13 film, Goku actually absorbs the ki gathered from the Spirit Bomb, becoming one with it, transforming and manipulating the energy himself.