My lv33 High Elf is pure offense. I have only just bothered to level up health (120), my Stamina is 139 (+39 from an enchantment), and Magicka is 683 (enchanted items included).
I only have light armor boots/gloves for defense. I have a Dragon Priest mask (Heavy Armor, 25 def) that I'm about to ditch because I just got 100 Enchantment and can make better. Only my jewelry has been upgraded, not armor. 333% Magicka regen and bound to go up soon.
Since I play on Master difficulty, with about a 52 Def Rating, and have Apprentice Stone (x2 Magicka regen but x2 dmg from magic), I can essentially be killed in 1-3 hits from most enemies, especially mages (damn ice spike).
It's a powerful offensive class but you will die often depending on the difficulty.