Pretty much what Ualaa says. Exorcism is great for leveling and dailies, but falls short for dps, pvp or pve. Versus an 85 target with 3.5k resilience, you will do about 2k dps, including Holy Shock. You mostly can spike down single targets using HoJ/AW but versus two opponents is a stalemate at best.

They will work fairly decent if you follow a raid around healing. 5x Cleanse can do wonders for classes that rely on mobility to keep their dps up. It is also a lot of fun to watch people try to re-apply dots you remove and just end up wasting time. I still have a long way to go gear-wise and skill-wise (im sure KJ-Alliance can attest) but it can definitely be a novelty composition and a break from what typical boxers are doing these days.