Although it's still early in release, I think the mage is striking the right balance. So far it seems to be the most powerful class offensively, thanks to disintegrate and lightning, combined with kiting, and the elemental damage from staves/wands. It also has some pretty handy defensive options, the mage armor being great (especially for traps, haha!), and the earth elemental being an effective meat shield. However, it doesn't feel overpowered because of two main reasons; first, it's the squishiest class in the game, and if you micromanage poorly and let the enemies close in on you, you're completely boned. Even at high levels with better armor, you're incredibly vulnerable. Second, it relies on advanced skills more than any other class (in my opinion). This means that, although it ends up being probably the strongest class (again, my opinion), it starts off pretty weak, and it doesn't really kick into gear until you reach icemist.
So yeah, keep up the good work David, I'm loving the mage so far.