Leadership

   King Duncan is a good and honorable king.  He is good to his people and he is very loyal.  He is liked by all of his kinsman.  Macbeth has a very hard time killing him because he is such a good and loyal leader.  "We will proceed no further in this business.  He hath honoured me of late"(1.7.31-32).  Duncan's honorable and loyal way of leading his people has made him very likeable.  This way of leading, though, isn't a good one if you want to keep power.  His loyalty lead him to his death.  He had been betrayed before Macbeth too, but still he continued to trust others.  "Assisted by that most disloyal traitor the Thane of Cawdor"(1.2.52-53).  The Thane of Cawdor betrayed King Duncan and Duncan still didn't change his leadership and this cost him.  King Duncan is a good leader, in the sense of being honorable and loyal, but not in the sense of maintaining and gaining power. 
   I think that Machiavelli would find Macbeth to be a good leader after he kills Duncan.  Before killing Duncan he was nervous and indecisive, but after that he became what Machiavelli would consider a good leader.  Machiavelli said, "The ends justify the means."  Machiavelli has been using any means to gain his power, killing Duncan, Banquo, and Macduff's family.  He does anything to become king.  Machiavelli also said, ""It is better to be feared than loved, if you cannot be both." Macbeth, unlike Duncan is only concerned about people loving him.  Macbeth said he wants to be the devil, he wants to be feared.  I think that Machiavelli would find Macbeth to be a great leader.