Back in the aspd days, the ladies of the DFW metroplex had several annual contests, with judging. I don't remember the rules, but I believe about a dozen ladies decided to participate, and the contest lasted several months whilst the "judges" made their visits. I believe one of the providers who was not participating, was the impartial collector of the points system; not sure. I don't know how many judges there were, but my old buddy Laine was voted "best" and I think she won that distinction more than once.
http://www.laineoftexas.com/
There was a dedicated thread or forum just for the contest, and the reviews were fun to read. It really brought the hobby community together and looked like people were having fun.
Now...as to what constitutes a great BJ, I recommend a new discussion thread. We need one of those about once a year.