Well I'm running an Oozemancer and a Fire Archmage at the same time, and it's hilarious how much more powerful the oozemancer is. With the archmage I constantly fear for my life, fleeing at the slightest danger since it's just so damn fragile.
My fight against the Sandworm Queen was the absolute nadir, I only survived because I had a cloak that allowed me to die at -50 HP. I was below 0 three or four times, and the last encounter consisted of me being constantly blinded, throwing all my CC and damage at the place where I suspected the Queen was since my teleport was on cooldown, and my vision was range 2, which is hilarious when you think about it and horrifying when you are playing. I haven't died by some miracle, but I'm about to face the Minotaur, and I still can't find a source of removing mental effects.
The oozemancer just oozes his way through hordes of various enemies along with his merry oozes, while being constantly healed by two auto-use regen infusions.
I'm not calling for a nerf on the oozemancer, heavens forbid, I like that there are classes which are easier than others since sometimes you just want to blast stuff. I just wish the Archmage had a bit more high-range stuff. Fireflash is such a bad spell, damn.