Moodle is used for just about any purpose that involves Teaching and Learning. One way I have seen it used is to teach semi-literate adults how to spell, read, write and speak English. Another is for a group of semi professional actors to disect characterizations and discuss how a particular character may be played. I understand a school for the Visually Impaired uses screen readers to teach a whole raft of academic subjects. I understand Moodle is used in so many different ways that even Elizabeth Barrett Browning would be hard pressed to count them.
The right out the box version can be improved upon, but how far do you really want to take it?