I'm with Sherbert. I gave mine to Mr Ian Botts, who is a phenomenal person who also beat the tar out of me. I recognize that not everyone can put aside their ego (hell, I fail regularly, it's just that you can't hate Ian even while he's destroying you! :P) but it is certainly a goal.
I appreciated that the sports form said "3 -- a good, solid OFCC game". I gave most of my opponents 3s, because they are good, solid, games. Astronomi-con in Vancouver uses 1-5, and continually fails to provide feedback on what a "regular game" should be. It should be a 3, if you played the game, and your opponent wasn't a douchecanoe, he gets a 3.
I would oppose a checkbox system. Did I bring my measuring tape? Did I tell my opponent what I was doing as I did it? It may be objective, but it doesn't really capture the essence of sportsmanship, and it feels weird. In the worst case, everyone gets the same score because they all brought their equipment (AdeptiCon has this on their form). And in the best case...you have a room of people explaining their moves as they do them? So weird.