You can't shutdown an unstoppable titan, a mid nova bomb Warlock with Skull of Dire Ahamkara, a radiant skin ram (or a self rez ram with a solar chest piece) a Sunspot Sunbreaker with a GG shot (there is a lot more). Shadowshot can cancel any super but so can a suppressor grenade (which titans have) and BD can't one shot any super (to compensate for the roaming) and right now it's hit detection is garbage.