As a complete contrast to the MPAA, I absolutely love Quebec's film rating board.
There's a high degree of transparency, and they actually seem to account for context. Their ratings are G, 13+, 16+, and 18+. 18+ is extremely rare when it comes to theatrical films. G and 13+ are far and away the most commonly used ratings, with many films that are rated R (and even NC-17) in the US receiving a 13+ rating.
It's crazy, it's like someone actually designed a film rating board for the real world! They actually trust people to think and use their own judgement.