Diablo 3 is fundamentally broken

[MongoJerry]

The sad thing is that on classes like the wizard, which have naturally high enough regen anyway, signature spells are a waste of development time really. They're not powerful enough to be worthy of one of the six spell spots.

I think you'll find a lot of disagreement with that statement on Wizard forums, but it depends on what what you use for AP spenders and how you have your defensive skills set up.