Ron,

I, too, agree with Tricia and with most of what you said, except for the part about judging papers.

As you mentioned, the purpose of the presentation is to get people to want to read the paper. I think the key evaluators are the members of the audience and that the two principal questions the "ratings" should be trying to answer are: (1) "Did the audience like the presentation?" and (2) "After the presentation, how many members of the audience indicated that they intend to read the paper?"