I like Orisa on the Attack side of escort/ctf. Some of Rheins capabilities with the shield, but the ability to do ranged attack to help push back the Def. can be a useful addition. Need good support and some heals tho or you will get smoked by any organized attack. Had a few good rounds with her, used her well to cap a few flags by getting in a corner with the shield out, little mini bubble for everyone to gather under. I will use her power-up just as the shield drops and by the time it ends another shield should be up.

If the def is smart and is swarming I will always go back to Rhein for his hammer to clear out close-range Def tactics.