Another Dualshock 4 user chiming in, the flashlight controls did NOT work for me at all in SOME rooms.
In some rooms, it worked like a dual-stick shooter, in some rooms, it was completely impossible to walk backwards while aiming in front of me. The very first time you encounter an enemy with the flashlight (where the lightbulb pops out), I tied 10+ times to move around him while keeping the flashlight on him and it just didn't work. Eventually just had to run and ignore the flashlight.
In other rooms, it worked perfectly.
I think part of the problem was that when you were around enemies it sort of "stuck" you to the enemy when you were within a certain proximity from them, or at least that seemed to happen to me. But it was inconsistent and wouldn't always do it. Bummer, as this was really the only section that bothered me about the game.