I love Wizard... I love the way he's developing his powers. It's like a transformation, A chrysalis transforms into a butterfly. In the beginning it may seems he's week. He needs protection, cause he needs to know himself. I mean being a wizard is not just easy. Starting with a basic cantrips, first level spells like "Magic Missle". And trying not to die from some kind of a surprise arrow, being shot by some nasty goblin... ;>
But ou boy, when you finally can cast a Fireball... feel the power which comes from your mind and see how you can change reality with a snap of your finger. Then real magic starts.
Somebody's rude? Use Fireball on him. He's Immune to fire magic? Well then use Cone of Cold... He's Immune to cold? Well let's Dominate him! He's immune for any form of mind spells? Well then let's summon some monsters from another dimension, they'll take care of him. In the meantime when you're almost feeling like a God, why don't you just stop a time? Or summon some devils from the depths of hell?
I mean you can be anybody by being a wizard. You can use every spell to became what you want. You can turn yourself into a war machine if you like to, which is stoneskin, which is surrounded by flame. And all of this because you know how to do it! Because You're educated, you can become even a Lich if you on a really dirty dirty road. But your powers are not limited by gods, like in case of clerics. Your powers are yours on your own. And you can shape the world in every possible way, only being limited by your imagination... What can compete with that?!