The monk was far stronger. Kills everything faster, takes little damage, much better CC.
And I'm not a noob at playing a caster, its my primary class of choice in these games and I had no problem in torchlight, sacred 2, PoE with the caster classes. But the one in D3 just felt incredibly weak and boring to me, especially when I played a monk right after it.
I was kiting, I hated it. Run around, cast a few spells,completely out of mana and hardly anything was dying, while my monk was just 1 hit kos, fun fast combat and really enjoyable.