Err, Oblivions Mages were overpowered as hell. At around level 30 a Mage was completely unstoppable with Invisibility, Chameleon and Paralyze spells, not to mention 100 point damage attacks that could do more than 1 type. Mages in OB are unstoppable.
And you can enchant quite a few pieces of gear as a mage:
Hood
Shirt
Legs
Shoes
Wrist Irons
That's a lot of +Magicka.
Yeah, my character is a Sorceress
(custom class), with her major skills being Mysticism, Illusion, Alteration, Restoration, Conjuration & Destruction
(in that precise order as what she studies the most to least). She never ever wears armor and only carries a dagger as backup. When I joined the arena, I made a custom shock spell that used up almost all of her magicka. It was like, damage 100 pts for 4 seconds on target. She has a high mana pool, too. And the arena was boring as hell. Every foe I encountered was killed instantly from a distance. Except for one battlemage I was fighting towards the end who had an elemental shield for all types. So I had to kill him the old fashioned way.
But the point being is that playing as a spell caster in OB made the game super easy. And when you think about it, if you can enchant stuff to have constant effects of "reflect spell", "absorb spell" and "shield", then you're pretty much invincible. No one will be able to silence you and no one will be able to do damage to you. Anyone else agree?