It's pretty funny in a 60 dungeon. You can Sword Oath on bosses the whole way. but with any decent DPS in group, you'd basically be doing nothing but ROH spam just to keep up. which... is still more dps than if you did only DPS combos in shield oath. You end up keeping up the STR DOWN debuff on boss in sword oath. If you're gonna shield oath, I presume the reason is you have a good healer who can put out tons of dps, in that case you might as well ROH every 3rd combo, to increase the dmg reduction, because it honestly doesn't hurt your already low dps that much.