I'm struggling to understand any opinion that Jaws isn't horror. It evokes the exact responses in audiences that a horror movie sets out to do. If there's a single movie that sparks a fear of the ocean, it's this one. Is it because it;s Speilberg? OR because it made a lot of money?
For me, I hadn't thought about it too much while doing my initial pass, but it wasn't in my top 40. I guess I would just refer back to IK's post and thoughts about SotL. This is the movie I referred to that is in my top 5 all time movies, so it would score quite high on the movie quality line, but for my initial thoughts it wasn't "horror enough", but honestly haven't thought about it much after that. There are a few that I don't really have a great reason for leaving off, love a lot, but still don't feel right putting on a list of horror movies - Psycho, Silence of the Lambs, Jaws are the top ones I was thinking about.
It's one of the reasons I struggled with the list. If I admitted it's horror, it should be at the top if it's one of my all time movies, right? But it still didn't feel right having it in my top 5 horror movies list and I didn't want to have movies like that in the 40s-50s either.