Thats what the op based this all on...
The OP based it on three very silly built high end characters (the rogue should be majoring in Health, not stamina for instance) that he then used to kill off a cities worth of NPC's. The Warrior had a much easier time then the others.
Ok, you win there.But wouldn't most of that damage be overkill? Plus, you can be a godlike DPS caster with destruction and enchanting alone.For warriors, you'd need 2H, Archery, Enchanting, and (possibly) Smithing.
You're not a very godlike DPS caster, since it takes a year and a half to kill anything at the later levels with those spells and many of the bosses are immune to the stagger. And this doesn't even account for the risk of giving yourself an epileptic seizure from the over-large spell effects (The entire room blows up, and the orc only loses 10% of his health bar, really, really?) and the tendency to kill any friendlies in the area by accident (Friendly NPC's appear to not scale as well as enemy NPC's).
Idly a tip for those that like doing the DPS thing with mages, you'll be doing vastly better DPS if instead of Dual Casting, you instead first press the Right hand, then Left hand so you have both hands charged with different spells. Then you start alternating by releasing right->release left+click right->release right+click left etc etc. You'll now be shooting spells like a machine-gun.
However unless you exploit enchanting to get spell costs down to 0% you'll be going out of mana rather quickly(about 3-5 seconds).