Last I looked, 25% is not chump change for damage reductions. We make up for lack of crit from wrath with internal release. We get full effect from maim and path. 20% off raging strikes. We lose out on our 300 potency attack every 5 wrath stacks - but we make up for it with our Butchers Block (still a 280 potency) and Skull Sunder hitting way harder.

We definitely don't do less damage.

This also ignores the fact that MRD can pull better healer defense than a WAR. Keeping your healer alive and pumping out medicas or fairy heals is better for survival than being the last man standing on flag.