Shoulder charge is perfectly balanced, you're easily killed whilst using it, it gives you tunnel vision, turning with it is awkward, you're only argument is it's one hit kill ability, now let's turn that on it's head, the hunters blink strike is a one hit kill from behind , and this often bugs out giving a one hit kill from anywhere, the warlock has a melee with the range of most shotguns, and that is why it is balanced.