I didn’t have a chance to confirm short stuns DR when I wrote that and should probably go back and add it now that you’ve reminded me but Earthquake is in (or should be in) a shared category explicitly with Warrior Charge and Dragons Roar.
In an Arena I’ll use it for zone control or vs. double melee when they’re on a target that is currently immobile like my healer because of chains of ice, stormbolt, FoF, etc if we’re playing defensively.
In Battlegrounds I drop it on flag nodes in the same way Madalynn explained above.