The emphasis on context is nicely illustrated by the example of The King's Speech, which the BBFC recently classified at '12A', in contrast to the 'R' rating awarded in the US (similar to a UK '18').
There are many fine film, theatre, TV, games, music, fashion and food critics. Make your own list of the popular arts and take your pick. But do we need some more of those independent-minded souls who stand back a bit from the fray?