I've been a DRK since hw launch and raided in current content. Only thing needs adjusting is TP, Grit costing way too much mana, living dead tweak possibly make the first 10s a ward based on %HP and keep the walking dead. Dps seems fine. Survival isn't bad have tanked everything currently. Just need to be smart with CD and soul eater heal. If full vit your soul eater not going to heal much. My tanking progression set up is 2/5 vit rest str I heal myself for 1k plus every time I use soul eater. Also need to play smart use the right tank buster CD dark arts after it hits immediately soul eat... 1k heal plus healers heal you are full hp instant. DRK involves situational awareness than the other tanks imo, you can't just hit any CD it has to be the right one. They aren't bad just need minor adjustments. If they don't change tp should make auto attack hit a bit harder imo. Good luck!