I think the quality of the breeder should be the issue. Miniature Aussies/North American Shepherds are in that grey-area of not-quite a breed, not-quite a fad either. Some of them are serious competitors in fly-ball and agility. They are, one could say, a breed in development. And the controversy about size is appearently fairly old. I'd see how the breeder is OTHERWISE before condemning him or her.
Now, toy aussies, on the other hand . . .