IMO, the show is abysmal and its the characters that make the show worse.
The plot lines are amazingly generic, they've been done a million times on other tv shows ad nauseum. The characters are really bland, really don't have personalities of their own and they're just downright cliche (whoa, is that dog talking? That's so cutting edge!).
But what really sends this show spiralling down the gutter is its use of Flash animation. I have nothing against Flash (I use it myself!) but if you're going to animate in Flash, at least make it look good. We have all these wonderfully-animated Flash cartoons like Fosters Home for Imaginary Friends, Superjail, and latter seasons of Harvey Birdman, why can't the animators from Johnny Test take lessons from those guys?
But yes, that's the end of my...erm....statement, so, uh, yeah, Johnny Test is awful. :sweat: