Yeah but Orisa has no shield and you can wait out her mitigation. She also can’t really protect her team.
She has travel time and spread
She can’t really do anything to contest high ground.
Sure but you can just… Not get hit by it, use cover use high ground, there are ways to avoid it
.
Sigma has an answer for everything Orisa can do, she spear spins, you rock her, she throws javelin you block it with your barrier or eat it with grasp, she start shooting you you stay behind your shield.
Maybe try using a character that isn’t doomfist when you go against her.