A system that discloses what’s in the movie would be better. You see an R-rated movie and that doesn’t really tell you anything about it. Is it R-rated because you see boobs one too many times? Or because someone says “Fuck” a few more times than is ‘acceptable’? Or is it because two men kiss? Or is it because 3/4 of the movie is graphic torture?
If there were (for example) icons for each category of “objectionable” thing, that were color coded green / yellow / red based on how many instances of that there are / how severe it is, it would let parents make actual informed decisions about what they want their kids watching (and additionally, let adults make informed decisions about what they want to watch).