Diablo 3 is fundamentally broken

[Athenau]

Uhm, yes, but 12/second when your AP regen is > 12/second is free. This can be done easily at high level either via Wizard equipment or Astral Presence. Please don't try to nitpick me when it comes to math. I do it for a living.

Only if none of your other skills consume AP, though. Using RoF means you're halting your regeneration. But I guess if Meteor pays for itself via on AP on crit then it doesn't matter.