The only thing I'd probably like changed about that fight is if that I wish the hellmages (or whatever, the one with the ground knock up) had slightly less HP. If you're using the queue it's kind of unusual for the group to be able to kill those particular adds efficiently.
That's a shame because, so far, this game has done a better job of capturing AD&D than any other mmo to date. That's just my opinion. I expect some hiccups. This is kind of a large one, but frankly, given what a prominent role Zen and AD play in the game, I would rather they take extraordinary measures now to fix problem…