Thanks for mentioning Temple Grandin, I saw her TED speech and she is awesome.

There seems to be a tension here. Too complex and the metric doesn't get applied, too simple and it gets abused. Of course in the case of cattle, there is no real manipulator, so no problems. But in case where there are conflicting incentives, this could pose a problem. Tax collection may be one such case. Too many criteria and they become inapplicable, too few and you have manipulation issues.