For instance, “Macbeth: An Analysis” gives no clue about what you're going to argue. It tells what play you're discussing, but nothing about your particular take. A title like “Murder and Meaning in Macbeth,” though, is a big step forward. It lets your reader know your topic.
Many professionals in the lit-crit biz are fond of two-part titles: a snazzy title followed by a more descriptive subtitle. A favorite game is to find a pithy and relevant quotation from the book, thus: “'Signifying Nothing': Murder and Meaning in Macbeth.”