I don't juvenile movies like Hostile enjoyable as I find they are the equivalent of an adolescent pulling off a living insects wings just to see what happens or what reaction he receives from the bug. While I enjoy movies like Paranormal Activity or any other supernatural styled film, I think modern cinema relies too much on exposition and jump scares than true dread or suspense. An example: look at the adaptation of Silent Hill. There is basically a 10 minute exposition in that where the narrator basically says "good job...you made it this far...I'm going to tell you EVERYTHING"...why? The unknown is what makes something scary. When you are presented with something that shouldn't exist or shouldn't be there once you find out the ins and outs of why the mystery goes away.
I think Paranormal Activity does a decent job of this, for the most part. They only explain what they need to for the sake of continuing the story opposed to telling you stuff just to tell it. Most Japanese cinema accomplishes horror better than Western, in my opinion. I say this after seeing something like Audition where if you didn't know before hand you wouldn't know as a "horror" movie at all until that one scene then it's a downward spiral. The Thing institutes dread better than almost any other movie (and I would argue so does The Game).
I think horror works when you see a situation that you see no positive outcome but it happens slowly and surely, as I said about The Game. You can try and explain things away as the narrative trucks along but as it goes further you have the option to continue to believe it's all fake or that this guy really is walking closer and closer to the metaphorical cliff and is about to jump off.
His horror is that he really has become his father even though he can't even remember him and in some way the audience has as well (if they have sided with his character).
Lastly, as I have already said, I think the gorier the movie the less scary it becomes. Typically, the more exposition and explanation the less scary it becomes. I really, really, really wish we could get a director to successfully make a Lovecraftian movie that isn't a comedic bastardization, a narrative mess, or that isn't SyFy channel quality garbage as there is true horror potential there. You don't even need a big budget At the Mountains of Madness movie to pull this off. Just the horror that a small person really is insignificant to the workings of the universe.
That's my rant at least.