The Saw movies with maybe the first one being somewhat original, I couldn't tell you anything and past maybe the second one and I don't even remember it the first two.
Army of darkness though, that movie is wonderful and fun, and you can typically show it to somebody who has no idea about it, and you don't need to see the previous films, and they will always have a fun time. I remember seeing the original trailers back in the early 90s and it actually had Metallica's holier than thou song spiced over it. I guess they bought the rights the trailer, and it's the only time I've ever heard that song in any sort of film. I know because the Black album had come out and my buddies and I were listening to it Non-Stop, and when I saw the trailer I was like holy hell that's Metallica!
Also, Freddy versus Jason was a wonderful comedic, cinematic experience. I just remember Freddy saying man the torpedoes, I'm shooting air canisters at Jason. For whatever reason Robert Englund delivered it so perfectly, because at that time period he knew that role inside and out, and what made it entertaining.
Maybe at the end of the day you just got to get together with a bunch of buddies, barbecue, nice cold beer, and fire up some classics, even if it's something that creeps you out. I know we all grew up differently, but doesn't mean you can't learn to appreciate good movies back when, well, good movies were made...