You're pretty much right, Atsume. These days so called "horror" films rely too much on shock violence for cheap scares. Blood, excessive use of gore, and an over-reliance on loud sudden noises. Of course we're going to be scared by that!! It's a natural reflex if someone were to sneak up behind us and yell "BOO!" :boo:
Besides, it's not "scary" it's "surprising." There is nothing "horrific" about that.
No, what it takes for a film to scare me is ambiance. There has to be a tone, a mood, an aesthetic. Horror is about what you can't see. Horror is about the unseen threat that is lurking around the corner. This is what legendary horror films such as Alien and The Shining do so well. The Shining was even set in a plain old everyday place, but it was the isolation of the characters and the prevailing sense of unease, the prevailing undercurrent of some unknown threat that had yet to even befall the characters that made The Shining so bone chillingly creepy from start to finish.
Also today, horror films rely too much on special effects. CGI is meant to be seen, but that just doesn't work for a horror film. The Alien monster was nothing but an animatronic puppet and a big dude in a rubber suit in the first film. Back then the monster would have looked fake if displayed out in the open like CGI is today, so the film-makers had to shroud it in darkness. It took more thinking than a couple of CGI artists can hack up in a few hours to generate some flashy CGI and still makes for one of the most legendary horror monsters in literature.