With the last hotfix that reduced all healers damage by a baseline 25% Avenging Crusader took a direct hit. It might still be legit in RBG paired with Beacon of Virtue and it works against 1,5k mmr yolo troopers, but with this blanket nerf it's definitely not viable for higher tier comps anymore.
If anybody feels the need to cry on US or EU Forums, please feel free to do so.
If anybody has had different experiences on high-mmr since the hotfix, id be interested to know.
But as i see it, they pretty much rendered this talent into a gimmick with this hotfix.