When I got back from lunch, I began my review work project of the day - the original FRIDAY THE 13th. The years have exaggerated in my mind the graphic gore content of the film. Yes, there are about eight murders, but you only see a couple happening with the blood effects. Most are either off-camera (and revealed later) or only the aftermath image for a few seconds only.
I guess it's the later ones in which the slashings become more or more graphic and in close-up. Of course, I think they had slightly larger budgets than this first one (which was made for $600,000).