UK, Aurangzeb was the son of Shahjahan. And he was a very cruel man. He was indeed very powerful, but history books in India describes him as a bad king. He had both muslim and Hindu subjects. Infact most of his subjects were Hindus. But he was not very generous to the Hindus.
His first duty as a king should have been to protect his Subjects and to rule them in a just manner. Instead he tried to convert them by force. Was he a King or a muslim missionary? May be he was a good muslim, but that doesn't make him a good king.