The jam do also needs to be better at promoting games with less the 20 rating. There is also a lot of people that needs to learn that playing and rating games, is an important part of a game jam. Only 560 out of 1900 games that have reach 20 ratings is really bad, and we could and we needs to do much better. I think that most the issue comes from the focus on making games, and much less on rating and giving feedback on games. A jam is a cooperation between makers and players.
Feedback and rating hopefully makes us better game developers.