If you want to try it out, go for it. It's pretty inexpensive, and it keeps you on your toes. The worst part about it is the fanbase. Not the game itself.
I have both games, got to night 2 on the first, and I couldn't even make past the 1st night on the 2nd game. :P But, if you really want it, you should get it. It's fun and it definitely scares you.
I've beaten the first one (even 20/20/20/20) and the second one. I still play it when I get bored sometimes, so it's fun to have if you're don't mind jumpscares too much. Although the second one seems much more enjoyable after playing the first one and liked it imo.
The game itself is fun, it keeps you on your feet and gets your adrenaline pumping sky high. If you want to try it, go ahead :) like star said, stay away from the fanbase. their a bit crazy in the head :p
If you want to play a scary game, play something like Amnesia not FNAF!! Fnaf is not scary at all in my opinion.
Anyway, if you like scary games, play FNAF. ONLY PLAY IT IF YOU ARE OKAY WITH LOTS OF JUMPSCARES AND LOUD SCREAMS. I can not stress that enough. If you aren't, I suggest sticking to Minecraft, or Terraria, or whatever you play.
Try FNAF2, it's the better one. The first game was luck, jumpscares, and praying to the Random Number God that certain things will and won't happen. On the other hand, the second game is actually not bad, as it uses actual tactics, strategy, and stress and time management skills to win. If you want to be actually scared, try an actual horror game like Silent Hill or something. FNAF's jumpscares are just the game over mechanism. Also, the fact that this game has been pounded into the ground tons of times may lessen the entire scare experience and increase the underlying strategy that many of the generic internet idiots overlook and either rate 10/10 or 0/10, usually with no in-betweens. When I play, I usually just end up laughing or getting annoyed when I game over. Anyway, play if you want, but if you will, don't think it's a horror game. however it is also a good game to play on the toilet