I've been analyzing gear for a mage fire spec and was quite astonished to find that Rawr recommended gemming pure haste for this spec. I was under the impression that both theory- and simu-craft had quite conclusively shown that crit is better than haste for this spec. Indeed, Ive done a small matlab analysis showing this conclusion also. Ingame experience with this spec using arcane gemmed gear also produces significantly lower dps.
What's going on?