I've talked before about the dumbing down of movies so they can get that coveted PG-13 and not be stuck in the limbo of rated R. Studios know that the bulk of the people going to movies are teens because let's face it, they don't have much else to do.
I have seen franchise after franchise choose this route rather than risk the lower profits of a R-movie. The one genre that this hasn't seemed to touch is zombie film. Sure, you could argue that the original Night of the Living Dead was pretty tame by today's standards, but the truth is the very nature of the creatures almost demand R-ratings.
