I don't understand complains about mage armour not being as good as regular armour - it isn't meant to be! You're a mage wearing clothes after all. To me, mage armour is designed to allow you to take one hit before you run off and heal. You aren't meant to stand there and tank damage from multiple enemies.
If you've ever noticed, the most difficult mage enemies in Skyrim are the ones that are hardest to hit, through constantly backing away from you as they pelt their arsenal of spells at you.