"Is Milton Better Than Shakespeare?" asks Nigel Smith in the title of his new book (Harvard University Press, 240 pages, $22.95). The obvious answer is no: It would be hard to dispute that Shakespeare's plays are more powerful, and more central to our culture, than Milton's biblical epics or his artfully classical lyrics. Around the world, when people dream about true love, they think of Romeo and Juliet; when they thrill with ambition, they think of Macbeth and Lady Macbeth, and so on down the list of Shakespeare's characters. Harold Bloom could even speculate, not quite in jest, that Shakespeare invented human nature, so completely does he seem to dominate our imagination of what it means to be human.