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Q1: Caster DPS VS Melee DPS in PvP
Even the most jaded of melee classes will admit ( I hope) they are dominating in PvP, which the possible exception of frost mages. In this author's view, it is because mages have the ability, much more so then any other class, to "open the gap" and prevent the melees from making contact. I've seen from your previous responses you don't want to have every other class have warmed over or simply reprinted mage skills, and I know I personally agree with you. But I think it's fair to say a little tweaking needs to be done to the casting dps classes, specifically, to make them not want to pound their desks in frustration. I know you don't want to give everyone Frost Nova, but it seems casters, from warlocks to shadowpriests to moonkins, desperately need a way to get out of the speeding truck we call melee.
This is a really large topic that's beyond the scope of a brief answer here. In general I think the "melee owns casters" mantra is too simplistic. As you point out, Frost mages generally do well in 3s and Enhancement shamans are not generally feared to the degree rogues and DKS might be, so you already have to caveat it a lot.
Q2:
