Like you and the good doctor have said, the definitive answer of "good" is hard to answer as everyone's definition is different. There are places where some might agree and disagree on what is good. My definition of good by way of producing the fundamentals of marksmanship/shooting etc on demand is just that. No matter what the drill, course of fire, etc, they are able to produce satisfactory results on demand. Again, what is satisfactory to me may be different to others but it's just a circular argument because everyone has their own definition.