I mostly agree; I wouldn't want to work for someone like that, there is some ambiguity though as usually they are themselves driven to excel at all costs, and sometimes they encourage people to excel in ways they would not without the pressure (even if at great personal cost). I think he is highly skilled at manipulating and motivating people to do what he wants, whether you want to call that 'good at managing' is another discussion, mostly centred around the moral connotations of 'good'.