Then suck. I blame lack-luster wizards on fools spreading silly misinformation like “Wiz 3 sucks don’t go wiz 3”
If you intend to do damage, you go wiz 3 for Quick Cast. Buff it to atri +5 and that’s +50% damage to all of your spells and auto attacks. Probably the best single buff in the entire game.
Some builds don’t need wiz 3. But if you intend to do damage. You go wiz 3. that’s the TL:DR.
I also recommend using plate and not cloth and not investing points into SP. But you can do as you like.
As for Fireball i’d rather it actually be a fireball, that you cast, with range, like a traditional fireball, not the silly version we have now but hey.