Any damage Moira can do is hard-countered by literally any healing. Her sustained damage is beyond a joke. Once you account for cleave, AOE effects, and secondary fire modes, she is the worst possible damage dealer in the game at her peak output… which is ~58 DPS sustained if she constantly uses orb (to full effect) off cool-down, if I recall correctly.
If you want something to complain about, you should try fighting a high rank Widow or Tracer and then see how you feel about a silver Moira main’s damage output.
Moira and Soldier are about the only truly fair fights you’ll get in Overwatch.