LENOX, Mass. The production of “Macbeth” at Shakespeare & Company in Lenox, Mass. through August 5, is visually compelling, fascinatingly staged and articulate. But oddly, and rather sadly, this drama about a brutal tyrant who becomes a victim of his own ambitions is emotionally empty. Directed by Melia Bensussen, the work is an examination of the title character’s mental state as he assumes power by his assassination of the king and eventually the murder of all others he sees as a threat to his power.