All parts of the entertainment industry should work together to make ONE universal code for: movies, music, comics, games, etc... to narrow down on confusion.
What I don't like is how stores follow these like they were the LAW. Its important to treat codes & ratings as a suggestion, mostly to warn parents of younger children. If I'm old enough to have a job to pay for the things I buy and my own car to drive to these places to purchase the item then I shouldn't be turned away because store policy states I'm not old enough.
"Treason doth never prosper, what's the reason? For if it prosper, none dare call it treason."
Sir John Harrington (1561-1612)