Personally, I don't really like playing Arcane in a heroic because of all of the drinking and the limited AoE, myself, though i'm actually OK with the point blank Arcane Explosion, I just wish the buff for it didn't need to be refreshed so much. It's just a small nuisance. Arcane is such an incredible boss killer spec though and I like the idea of it but I wish it wasn't quite so pigeonholed. Kind of like how Fire is pigeonholed as an AoE spec.
I'm comparing to other classes though, not other Mage specs.
I guess it doesn't really matter, I'm tryin' to min/max heroic DPS here, which is pretttyyy useless, but to me the fun of a DPS is always preforming your best. Competition always breeds success, something I wish more of the DPS of our raid guild had exercised, as there were two of us near topping our specs rankings at WOL every other fight and the rest not even registering.