What in your opinion are the best film adaptations of Shakespeare?

I've somehow avoided experiencing any of Shakespeare's work outside of Hamlet, Julius Caesar, and Romeo and Juliet. I prefer to see plays acted out rather then just reading them so I'm looking for the best film versions of his work to experience.

My personal favorite is Franco Zeffirelli's Hamlet, I watch it all the time and absolutely love it. I love how accurate it is to the play, as well as the costuming and set design feeling so real mixed with the gravitas and drama of the play.

Please share your favorites and tell me a little about why?