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.