I've been trying Demonology today, I haven't played it regularly since WotLK, but I seem to try it every couple of months and every time I end up switching back to Destruction for the same reason: Demonology just feels so awkward and convoluted.
I think it's the combination of the "demon dancing" plus the Molten Core mechanic, which is essentially a 3rd resource, and the different dots for different forms.
I know people play it because of its "skill level", but don't you think it's just a bit too awkward like this? Could it be improved without being simplified too much, maybe by ditching or changing Molten Core?