One thing to note, is that to me, Fan Dance IV seems kinda redundant with FD3... They both do nearly the same thing with small differences, but one looks way cooler than the other. I feel that FD3 should've just "evolved" into FD4 and allowed the action to accumulate 2 stacks.
Other than that, sans the much needed potency buffs, DNC seems to be really good in its EW design. Yes, it is similar to ShB, but I feel that not every job need a drastic element of change every single expansion. Perhaps 7.0 will actually add some heavy rotational increments to DNC?
