How bad are the issues with DRK?

[_Pigzig]

In terms of whether or not the job is strong or not, it's not awful

In terms of how well it plays, it's a disaster and a shadow of what it was in 3.X

The class is a cluster**** of redundant abilities
e.g. 1: Darkside which you now never need to turn off
e.g. 2: It has 5 AOE abilities.

It has a basic rotation that rarely goes beyond pushing 1,2,3(or whatever its keybound to) but more button presses than I've seen from any job in the game so far, due to dark arts spam and an extremely high number of OCDs that you're going to want to weave in between the 1,2,3.

MP fluctuates wildly due to the job having high regen as well as consumption. If you want to play efficiently you will have to keep your eyes on your MP all the time.
(edit: I haven't done any tanking at 70 yet so I'm not sure if this settles down once you get a higher MP pool)

It also suffers from the VIT accessory and tank stance problems plaguing tanks in general.