Every game has Aim Assist, but Destiny has a shit ton of it. I've played shooters for years, and I've never had even the slightest issue with AA til Destiny.
Coming from Battlefields, this sniping just feels...kinda wrong.
And I don't recall AA being a hidden stat for many other games, nor it being a perk that you can use.
But it is what it is. This IS a casual FPS after all.