I found the remarks of one of the judges to be very instructive. In examining which dungeons were really successful, I came to realize a shift in perspective.
Rather than thinking of them in terms of a dungeon on one page, they’re really more like One Page Settings. The setting typically revolves around a dungeon, but it’s still a setting. And the good ones have all the attributes of a good setting. Good characters, good atmosphere, good locations, good plot.
That’s the current state of the art as far as my thinking on the subject goes. So far.