I have never seen any Saw or Hostel move. From my understand they are just gruesome violence for it's own sake, is this correct?
I wouldn't say that's fair. I think both movies offer an eerie sense of dread and hopelessness that perhaps requires the viewer to wonder "What if I was in their shoes?" in order to get the most out of it. The gore is definitely there but it's not the main focus.
A movie that better fits your description is The Human Centipede 2. DO NOT watch that fucking movie.