If you are having trouble running out of mana as mage, something is wrong. Pots, evocation, and emerald should be more than enough to keep u going through most fights . I never worry about my mp5 , I won't give up dps or crit for it that's for certain.
Uhh..I'm an arcane mage. It's all about using every bit of mana I have. The more mana I have, the more damage I can do. So while a fire/frost mage may not have as many mana problems, I certainly do. Also, a fire/frost mage that stacks haste will have mana problems as well. You can't say that the mage sucks simply because they run out of mana. There are reasons behind it that are sometimes unavoidable.