The one that's most annoying to me is those really realistic looking horror games with no substance and cheap jumpscares that don't startle you at all. The thing with these games is that they might make you jump the first few times but as you keep going you'll realize that there's no real danger or possibility of death it's just there for some spooks.
Jumpscares should be accompanied with danger, and a horror game shouldn't allow the player to feel safe for even a second. Or atleast that's what a good horror game is to me.