Mage is currently the worst class.

It's a shame too, staffs imo are the most interesting weapon type in the game, but yet you need to stand in one spot to charge them up, they do damage to you and your friends (Making coop almost impossible with mage), and they do almost no damage to humanoids like OP said.

That being said why the hell do you need to stand in one place to charge them? They would be a LOT better if you could just move, I guess I don't see why they added that in.

 

In fact I made that very graph and posted it. I didn't test for more than one damage value (varying armor was easier) but I doubt that different damage values change the shape of the curve significantly. I also scratched my head for awhile trying to think of what kind of math was behind the curve but aside from it having a subtractive component it escaped me. It really doesn't bear any resemblance to any other game I've ever played.