BTW, I think I've also seen a two-dimensional model for that; I don't remember how the quadrant other than “good”, “bad” and “evil” (people who aren't terribly good at life, but at least try hard not to harm others as a result of their incompetence, even to a cost to themselves) was labelled -- wimps?

Sounds like two axes, one going from competent to incompetent, the other from well-intentioned to ill-intentioned.