Because rating of films depends on the audience not by producers. That's why rating from producers are not mention as valid.
It was created to keep the government from censoring films.
"Henry: Portrait of a Serial Killer" (1986). Stars Michael Rooker. This is one of the films that led the MPAA to create the NC-17 rating (adults only but not pornography). "Henry & June" (1990). Stars Fred Ward, Uma Thurman, Kevin Spacey.
No. The Entertainment Software Rating Board (ESRB) rated Modern Warfare a Mature (M) game. The British Board of Film Classification (BBFC) rated MW a 15. The Office of Film and Literature Classification (OFLC/Australia) rated MW an MA15+ game. The Pan European Game Information (PEGI) rated MW2 an 16+ game.
An unrated film or an unrated version of a film is one that has not been submitted to the Motion Picture Association of America for a rating.
PEGI 16
T is for Teen
Pegi-rating is an easy-to-read graphical system used to rate video games for age appropriate content across Europe.
PEGI 16+.
Halo: Reach has a PEGI rating of 16.
It is rated 16+, however I do not believe that this age rating is to stop you from buying the game, just to warn that it may be offensive to some.
ESRB and PEGI
PEGI 18+.
PEGI rated it 12+
No The PEGI (Pan European Games Information) ratings are 3, 7, 12, 16 and 18
The ESRB rating is Mature. The PEGI rating is 18. The BBFC rating is 15.
ESRB rated it: T(teen) PEGI's rating was: 16