Your best source of information would typically be the rule book or, in some cases, a separat judges guide is provided.

The judging methodology depends very much on the event and most rule books state how various characteristics are to judged.

The [link=http://www.maac.ca/committees/docs/rules_rcscale.pdf]MAAC Scale rulebook[/link] covers scale competition in Canada, in it you will can find detail, intended for judges, on how to score.

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As for some competitors competing in fun scale, I can only speak for myself. Although I have competed at the World level, I still enjoy competing in local contests. I don't fly the same models in these contests (I think that would be unfair), I fly my fun scale models. Are you saying that, simply because I may be actively competiing in more rigorous categories/event, I shouldn't be allowed to compete in the local events?

Hope this helps.

Jim