So just wanted to add a little feedback on Drk that I had. Keep in mind I haven't played it to 70 yet this is mostly based off reading tool tips and having a level 60 Drk.

Scourge: simply put would like to see this return.
Delirium: keep the 4.x effects but make it combo off of Syphon Strike. Removing this as a combo action turned Drk into a boring 1-2-3 job in my opinion.
Syphon Strike: why does this need a dark arts sub effect? feels like I'm spamming dark arts way too much. Maybe others could weigh in on this for me.
The Blackest Night: will echo what others have said with it needing a longer duration. Maybe give it a blood gauge cost?
New job mechanic: would like to see it added (maybe a trait?) where the lower your hp is the more potent attacks become or something like that.
Rampart: just a little nitpick but I don't like the icon at all. (Doesn't match Drk skills)