As for the question "are their matches boring", I think their last two matches (and even the one in the Olympics) have been great, great level especially, and they more and more look like a rivalry for the future, Nadal will need to go back very strongly to fight with them.
Their matches before were more boring, including the one in Melbourne in my eyes.
I actually think their most incredible matches so far have been Rome 2011, AO 2012 and Shanghai 2012. The problem with these two, as much as I love them, is that they neutralise each other and make more UEs that it's usual for them. However there are long patches of stunning shotmaking in all their matches which makes up for the ups and downs.
However i enjoy Rafole matches the most. Federer-Djokovic too.