One more vote for disgusting.
In my mind, there are two kinds of food in the entire world: Salty and sweet. Only rarely shall the twain ever meet. And definitely not in this case.
Peanut butter should be put on sandwiches, and possibly on celery, but not much else. Definitely not on hamburgers.
This is almost as bad as chili-flavored chocolate and apple pie with cheddar cheese. Both of those are more disgusting than this (although not much more!).
That being said: PEANUT BUTTER JELLY TIME!