I always play on Normal.
As for Arcane Warrior, in the end it is faster & cooler to simply "shake & bake" all enemies. Sure a frail Elven chick running around in Juggernaut armour with Spellweaver is fun at first, but it also turns the game into a round of whack-a-mole. You're invulnerable against anything that isn't orange marked, but without melee combat abilities just auto-attacking everything gets really boring.