The MPA system is broken and needs to be fixed. When I was a kid G, PG, and R meant something. PG-13 was used only for something not quite PG, not quite R.
Now almost everything's PG-13, except for kids' movies which are PG (what happened to G?), and sometimes they'll put out a movie that's R. It's not about the content, unfortunately. It's all about, "PG-13 is what makes the most money, so that's what we're going to rate most things now!" It's about money instead of being the useful tool for parents that it was intended to be after the Hays Code was done away with.
I usually don't like PG-13. To me it says: PG movie with something stupid or unnecessary thrown in to make it PG-13. Or it says R movie with the guts cut out of it (figuratively and/or literally) to make it PG-13. I don't think it does a movie any favors in either direction.