I understand exactly what your saying here but honestly I personally think " The Thing " has all of those. One of the best horror movies ever made imo. Some of the scenes are very tense and the movie has a very edge of your seat vibe to it.
I remember crapping it the first time watching the scene where there testing the blood samples !.
If thats not horror I don't know what is. Sure the gore can be over the top but at the end of the day its a horror about an alien that basically rips you apart and becomes you.
I'm a person who could watch the most horrific thing in a movie ( as long as it isn't real ) and not be phased at all though so I guess its all about what effects you and what doesn't.
Do you not think the gore in RAMBO and maybe even the other two first blood sequels was a little overboard ?.