Most Shakespearean dialogue is convoluted to the average person and restricts the potential audience of your game to a much more specific demographic. Not only are English AFL people reluctant to read this sort of thing, English ASL people may find it much more difficult to comprehend outside of the literary references it may have. Honestly, it doesn't add much more to the game than regular dialogue. Clear and concise is always great, especially in videogames. I'm not opposed to crafty vocabulary, but truly Shakespearan dialogue would be a wreck.