If the course material were covered, and the instructor went over it with the students, I don't see how there would be a problem with a 10 dive student navigating. I took AOW because I needed a card, but had learned the material years earlier, so I had plenty of bandwidth to watch. I don't know that the guy I was buddied with even had 10 dives, but when done had a good idea of the principles of navigation, what he was trying to accomplish, and could swim a compass course. I've seen divers with significantly more dives understand less.
It is too bad the people that ran your class were not more interested in teaching, but that has little to do with the students.