I think the key to answering this question is who we ask. I would suggest multiple perspectives from people considered by others a good leaders, people who assess others as good leaders, and people like academics who research good leaders. Then there is the whole issue of definition. I can read a dozen articles and studies on "good" leaders each of which define goodness in subtly or significantly different ways. I still meet as many people who believe good leaders are good parent figures as I do people who believe that parent figure leaders are the worst.
The question of what makes good leaders can only be addressed in the initial context of definition.