There is a longer response to this jumbling its way around my skull that I'm hoping to lean on some of the more...verbose on the board to flesh out. They dont know, but its coming.
Essentially though, I dont need long descriptions of broken bodies, guts and suffering, but it needs to be understood that its still there, its happening.
I want the setting/art/rules, to reflect the fact that we are facing creatures with extremely large teeth/claws, that we are hitting things with very large/sharp implements, or we are blasting or being blasted by forces that do not exist in reality, all while our characters are largely biological entities with the same emotions, flaws, and weaknesses that we have.
Hit a watermelon with a hammer as hard as you can.
Now imagine thats half a dozen other watermelons, and your friend was a bear and took apart a few more, while your other friend set one on fire, and the last put 3 arrows into another.
PG just cannot cut it, and I dont think PG-13 does it either, so R it is.