That category was more to do with the "use of space", which, given it is the point of the jam, makes it very important really. So, it will be staying but will likely be reworded to be clearer.
Also, on your point about anything less than full marks pushing someone back several pages, is simply not true. There was some complaint from individuals about being ranked under 100 in that category, and thought that was bad. Where it actually isn't, the majority of games got very high averages in that category, and it's just a matter of "you can't all be first." If you care enough, you can look at some entries and do the math and you'll see. One of the top 10 places, for example, is ranked 93rd in Authenticity and still has lower averages in other categories in which it's ranked higher. And the Overall ranking is based on your averages, and some magic with the number of ratings, thus the ranking of Authenticity doesn't really effect the final positions that much.
Ultimately, I think it's more about people being confused about how the system works, rather than the system being wrong. But I'm open to feedback, we got a while to work this out, after all! :P