Her ult is strong, but the issue is she instagibs 2 people on the roster with a hitscan bodyshot with minimal charge time, and deals well over half health on a body shot to the majority of the cast. I'd expect that kind of damage on Hanzo since he fires projectiles with drop, not on a semi-auto hitscan weapon that also has close range fighting capabilities. I may or may not be biased as a Zenyatta player.
Speaking of shot drop, why the fuck does Mei's secondary fire not have any drop? Almost every other projectile in the game that can deal headshot damage has drop, and the exceptions are only her and the supports/no-mech D.Va. And I'm fairly certain they travel faster, if not just as fast, as Hanzo's arrows.