I got all 3 generators. Did I scream the first time he appeared from behind the wall? yes.
But after that, he's a little too easy. You might be seconds from dying and just poof - turn off the flashlight and you're good. I think he should be able to see you if you're close at least without the flashlight.
But besides that I think the coolest element was waiting at the gens waiting for the bar to fill up know well he's coming. This was the most tense part and that's what you should work with.