Let's be honest here, no one really uses Unstoppable. Yes, it is very frustrating when I am killed in the middle of my FoH, but fixing that is nowhere near enough incentive to give up shoulder charge or juggernaut. Also, if Unstoppable becomes useful, it will give people a reason to use the Eternal Warrior helmet. It's a shame that such an awesome looking exotic goes unused because of it's perk. If I were to make a suggestion, I think it should also give a temporary overshield after using FoH. Or give FoH a shorter cooldown. Or give FoH a larger damage radius. Or all of the above.