I have attended two events thus far, and I have found that the way the head refs call things are very similar to each other. This is due partly to a conference call that ALL head refs participated in, making sure all were set on the rules.
I am sure that at the Championships, all the refs will be on the same level (I hope) therefore ensuring a level field on all the fields.
The thing you have to remember is that the refs are not professionals, and most of them did not go through a 6 week build period memorizing all the rules. As long as they are as fair as they can be to all the teams at thier event, i'd say it passes in my book.
But then again...rules are rules...
aggh...it is a tough topic
-Gabe