Hello, I'm a level 67 fire mage, and I got a newb question..
I picked the Fire spec pretty much randomly when I started my toon, not knowing at the time really what each spec's advantages were. I later learned that the advantage of a Fire mage is that, while not being as good at PvP or with PvE farming, it is very good in instances. The basis behind the Fire spec is high damage dealt.
However, whenever I use this at the full potential, I always draw aggro. The response to this is the obvious "Don't spam your spells, and wait for the tank to secure aggro." Well, I try to always wait for the tank to secure aggro (I'm almost always the last nuker in the party to begin attacking because of a paranoia about this), and I've of course learned not to spam Fireball or else my DPS will quickly pass the tank's and I will pull aggro. So, I either cast Fireball more slowly, or do more with Scorch.
And this is where I get confused: casting hard-hitting spells slowly does the same damage as casting weak spells quickly. So what is the point of having the hard-hitting spells at all? From what I read on the forums and on the wiki, Fireball is the be-all-end-all of instance spells. But why bother having all those Fire talents that increase damage done by Fireball if you have to cast more slowly as a result for fear of pulling aggro?
And furthermore, what is the point of ranged dps clothies anyway? If damage dealt roughly equals threat generated, then nobody should exceed the damage dealt by the main tank, (I know there are abilities that give tanks more threat and others less threat, but these don't seem to be *that* drastic), and therefore everybody would be better off rolling a plate wearing class and hitting at the enemy next to the main tank. 500 damage done by a warrior is no different than 500 damage done by a mage or warlock, except the former has better armor to protect themselves. Warriors and paladins can't do as much damage as mages or warlocks, but since mages and warlocks must rein their DPS back in anyway, what difference does it make?
This has always seemed to be a paradox to me. Everyone says that the dps must "do damage" while the tank holds aggro, which is completely misleading if the dps has to make sure not to exceed the tank's damage dealt. I'm sure there's an answer somewhere, but for the life of me I can't figure it out.