1. directors are sadly missing the point
making a movie gory and gross is not scary just because you do not want to look at the screen does not mean that you are scared.
look at halloween (1978) the movie had little blood at all yet it created an unsettling "check behind you every 10 seconds" atmosphere that is yet to be replicated
now look at Saw(2004) sure its cool to see gory ways to kill people but not only was the acting a joke the whole movie was nothing more than an ugly sight.
in short i would rather have a ton of blood and organs in my room at 2 AM than Michael Myers.
2. jump scares
a jump scare can be good if done right it has to be mixed in with other tactics of creating fear if you want it to be effective.
but its not good if you just throw 100 jump scares in my face at once its just annoying not scary.
3. tired scares
old horror movies would play on humans basic instincts of being afraid HP lovecraft for example did a fine job, you were scared more after the movies just thinking about it.
4. crap like paranormal activity
a movie that is supposed to be made by a guys in movie camera is a great idea but it is done so so soooo poorly it was depressing.
if this is the innovating new horror movies are doing the industry is doomed.
5. people have lost what makes a horror movie a horror movie
i want a chilling movie about things that go bump in the night i want a movie playing on the fears i already have not some sadistic torturer porn.
halloween,friday the 13th,the terror train,the texas chainsaw massacre,prom night,i know what you did last summer,black christmas. THESE are good slashers i can not think of anything in the last ten years that has even come close. the genre has lots more to do its not dead its just hit a pause