Man, people are too dumb to read shakespeare.
1) Shakespeare did indeed copy R&J from other texts. So did a lot of other writers before and after him (Bram Stoker off the top of my head). Deal with it.
2) It's not 'Old English', Beowulf or Chaucer are old english. This is middle english. If you can't read it, it's probably because of the literary/historical allusions, not because it isn't 'really' English.
Anyway it's spawned a dozen shitty movies but it's still one of the bard's best.
Joyce was a good writer and all, but his poetry was awful.