Visuals: 7 - The action this episode is really good with some pretty nice animations. The facial expressions, especially when characters get hit, are on point.
Audio: 6 - Goku's voice actor does a great job this episode and the music and lack there of sometimes fits very well.
Plot: 7 - Most of this episode is action and not the kind you're used to. This episode is more brutal than most and will really leave you surprised about how Piccolo is so strong.
This is a great episode, it delivers a few funny moments and then brings everything down with Piccolo's monstrous strength. This episode has a first for Goku and takes what Dragon Ball uses as a way to subvert expectation and turns it around.