But Tracer, Reinhardt, Genji, D.Va, Mercy, and more can all get out of it. Rein and D.Va can shield people caught in it, as can other Zaryas. And there are two other ults in the game that effectively nullify its effect.
It's the easiest tool to position the entire other team with. Now all you need is a Mei and proper timing and you can bypass Lucio's and Zenyatta's ult. Nothing is as all encompassing of a buttfuck as a Zarya ult and a touch of teamwork.