I honestly think Shakespeare lives up to his title: Greatest playwright of all time!
He combines so many themes into his tragedies such as guilt, power, love, personal destruction, greed, personal ambition, death, and etc. Not to mention, if there was no Shakespeare, then, The Lion King probably wouldn't have its emotionally compelling story it has now, in which TLK was inspired from.
So far, I've read:
Romeo and Juliet
Julius Caesar
Two graphic novels of Macbeth
A graphic novel of Hamlet
A graphic novel of A Midsummer's Night Dream