Arcane Brilliance: First impressions of arcane in Mists of Pandaria

I've had a love/hate relationship with arcane. As I mentioned last week, when I first started my mage I had every intention of playing arcane ... but that was back in The Burning Crusade, when phrases like class balance and raid-viable didn't make sense to me. When my mage started growing in levels and I found out the best raiding spec for mages was destruction warlock, I jumped ship.
My mage hit level cap during the height of arcane's PvE dominance in Wrath of the Lich King, and I decided it wasn't the spec for me. When my mage capped again in Cataclysm and started preparing to raid, frost was enjoying its brief period as a semi-viable spec, and I had a secondary fire spec for Alysrazor. I haven't had much cause to go arcane lately, beyond Spine of Deathwing when we were progressing, and up until now I was pretty glad for that fact.
That is, until I hit beta. After writing my first impressions of both frost and fire and totally dropping the ball on my original arcane speculations for MoP (pro tip: Arcane Missiles is still a proc), I thought it was my duty to try out arcane. I told myself that for the sake of science and fairness, I'd give arcane a shot. After a night of streaming dungeon runs, dummy testing, and some Jade Forest leveling, I almost feel like I owe arcane a huge apology -- because in MoP, it's a legitimately fun spec.
Filed under: Mage, Analysis / Opinion, (Mage) Arcane Brilliance, Mists of Pandaria