For the most part, I do feel like resto is pretty weak in 10man until we get our 4 piece. As of now we can only get close to other healers if we actually get to utilize our healing rain. Fights like council and ji-kun are pretty shitty for us since people are usually spread out. Can't really say much until we get 4 piece though. I went from the main healer in my guild to the swing healer, since resto is only really good for utility. Lowering the mana cost of healing rain is nice for the fights we actually get to use it, but we're still below paladins, priests, and monks right now.