Hmm, that X factor point is intriguing. I can see why one might give greater weight to narrative voice than, say, setting. I can also see why YWO might not want to publicise the weightings - to stop people from simply focusing on what would get a higher rating.
On the other hand, it would be good to know upon what the weightings are based. For example if narrative voice and pace are the most important factors when critiquing a book, that would be good to know! Then, again, perhaps its obvious that your narrative voice needs to be strong, but improving on things like setting are easy enough to correct....?
On turning fact into fiction: African Violet blogpost on Sue Howe's site: http://howesue.wordpress.com/