What you observe or say about something largely depends on the perspective from which you are looking. For example, take the case of Ashoka. He was a ruthless ruler and he eliminated everybody who came in his path. Even today, he is despised in parts of Orissa, but in general he is regarded as an efficient ruler by others. If one looks closely at the rule of Aurangzeb, he was very efficient in governance and corruption was almost non-existent during his rule. It's true that he was intolerant when it comes to religion, but at the same time he extended total protection to the lives and property of people who paid taxes (zakaath for muslims and jizyah for non-muslims). As some readers have pointed out, we should look at the positive side of a person as well.