Have movie ratings ceased to mean amything?

From Gremlins’s trivia section on imdb.com:

Temple of Doom does raise some questions about a multi-axis rating system, though. Where’s the rating for “just plain gross”?

Temple of Doom certainly inspired the PG-13 rating, but go look at your video box of Temple of Doom. Note that the movie is rated “PG”.

Temple of Doom shook up the system, for sure, but the first movie to actually bear the new PG-13 rating was Red Dawn.