One of the main reasons to go PG-13 is to get a wider audience, and that will lead to more meddling to be appealing to all audiences and trying to over explain or go too far in simplifying the horror elements which can undermine any mystery. Not to mention the pressure to have a 'happy' ending.
From the list, Pulse is the one that seems to have checked all of the worst aspects of PG-13 horror. It's a remake that is Americanized with tons of cliches and has the lamest ending.