Scares and Spooky seem to imply "scary"
FNAF does a great job of making you scare yourself over the anticipation OF being scared, more-so than the actual scare of the animatronic getting you in the end.
I mean, you can boil it down to being a game hipster and wanting to hate the popular thing as much as you want, FNAF is a highly successful series that offers simple yet intuitive gameplay elements. That's what makes it successful and a good game. Adapting it to the big screen seems like a perfect fit. Most Horror movies now focus on anticipation of events anyway, FNAF is the perfect fit for that genre.
Scare yourself?
Doing what, popping out like the jack-in-the-box your mommy got you for your last birthday? There isn't an announce of horror in this series. There was essentially no gameplay. If you watch someone play with all the settings jacked to max you really see what the game boils down to, a simplistic game of tells. Know the tells, and you know the game. It's unique, i'll give it that. But not fun, nor all that interesting. With so little depth it doesn't take long to get bored of it.
I love kids who use hipster as a way of defending things they like with no real argument. Guess what kiddo, success doesn't mean something is good. But let me guess, you've read all the Twilight books, loved 'em to bits right? You probably own every copy of Call of Duty too. Only trash who can't come up with any real arguments slink down and pull out the "well it's popular so obviously that's why you hate it." argument.