Maybe in a vacuum you can't call it bad art, but in the context of the standards that DBS adheres by, I don't think it's invalid to say that it is.
It isn't about context, especially when Super have several different artists with their own art styles. It isn't like the manga where just one person draws everything.
And it isn't bad art because bad art is something that is technically wrong with the art. How do you think art students are graded if bad art can be as subjective as you seem to believe.