If there’s no way to objectively rate an actors performance, why are there acting schools? Why are there film schools?
Just because you can teach someone to do something that doesn’t automatically mean that you can also objectively evaluate whatever he/she does in the end. I can teach you how to make a pizza, despite not having an objective measure to evaluate the pizza quality.
Acting and film schools don’t give out grades or diplomas? Interesting.
OPRAH: You get a diploma! And YOU get a diploma!