Macbeth as a Tragic Hero?

For Macbeth to be considered a "Tragic Hero", he must have some potential nobility, some good qualities that make his downfall terrifying. He must be examined as a human being with human weaknesses. Is he one who, as Lady Macbeth says, Act I, Sc. v, "is too full of the milk of human kindness To catch the nearest way" or is he the "butcher" that Malcolm considers him to be in the final scene of the play? Or is he a victim of his ambition or of moral weaknesses or of his limited concept of manliness, or even of a combination of circumstances that cause him to fall?…