In "The Tempest," what are Prospero's strengths and weaknesses?

One of Prospero's major strengths is that he can do magic. We don't know precisely why—not all humans do magic, obviously, even those on a magical island—and he seems to be able to do so immediately, even before the book and staff. (Look at when he frees Ariel from the cloven pine, for example.) I would call his love for his daughter a strength. As for weaknesses, well, those will vary by period. I see his drive for power and revenge as a weakness, and his suspicion of other people, but I'm not sure Shakespeare's period would have. He seems brusque with Ariel at times, as in this line, when he threatens Ariel: "I will rend an oak / And peg thee in his knotty entrails till / Thou hast howl'd away twelve winters"