A tragic hero is more tragic if he is noble and corrupted by the outside world or the evil forces. However, if the tragic hero’s actions are more a result of some inner moral or intellectual flaw, then he is less tragic. In short, the hero’s fall is more tragic if he is initially noble or if the tragic flaw is not his fault. A noble hero who becomes seduced by evil forces or evil suggestions is somewhat in the middle.
Likewise, there are different interpretations of hamartia. It comes from the root to “miss the mark,” and differing interpretations will note it is to “sin” or simply to make a mistake. So, Macbeth is a tragic hero (of the middle ground). He is seduced by the vague suggestions of the weird sisters, which means he may or may not have been noble. When we meet Macbeth, he has just fought nobly? for the, then, King Duncan. And since he was plagued by guilt, which he mistook for fear, he must have had some noble notions. Hamartia is often described as a mistake committed by the hero unwittingly. Hamartia as a tragic flaw then applies more to a hero who commits a mistake or sin through no fault of his own. Macbeth is responsible for his actions. Macbeth is to some degree, a tragic hero. And I think you could say his flaw is tragic or hamartia also to a degree because he knew what he was doing for the most part, but he was pressured by his wife and there may be an element of supernatural influence on the part of the witches, but that may be giving Macbeth too much credit.