Blizzard has done a fantastic job of keeping most classes dynamic, having a FCFS system, or a fairly length rotation (unholy and blood DK's tend to be rotational, but since the cool downs come at different times it really feels FCFS)
This has not happend with arcane mages. I've said I loathe elemental as a valid dpsing spec. It's essentially "spam 1, dont let 2 drop too long, and hit 3 when it comes up"
Arcane mages are worse. "hit 1 four times. hit 2. repeat"
I hope arcane gets nerfed into the ground. There is no reason to be proud of your "fantastic deeps" if you're not even struggling to do the said rotation. "But what if I have to stop casting!" oh no! what if everyone else does? Either this, or it needs to be reworked heavily.
I like how DK's function. I like how enhancement functions. I've toyed with destruction and affliction, and they're VERY hard for me to get used to which is unbelievably great. Most caster classes are very lucky, in that for the most part their rotation is unfettered by positioning but man, I can't get used to that. On my affliction lock I end up standing about 10 feet from a monsters face, just because I'm so very used to melee.
My problem is still not with casters as they have their own issues over melee, its with simple rotations. Arcane is the newest of my hatred.