Maybe this will turn out to be an unpopular opinion, but here is what I think about dark knight:
It's way too similar to warrior in cooldowns and attacks, but without the self heal. In other words, it does not have a personality of its own. Another downside to it is that in EW it feels like you need an extra hand to be able to play it effectively, weaving the absurd amount of OGCDs into your globals. Example: for tankbusters in ShB, TBN was good enough. Now you need TBN and Oblation. Delirium change was the best DRK received, but it also means you have another gcd to press 50% more often than in ShB, or else you are not getting the most you can from it. Salted earth is another great example, where before it wasn't the end of the world if u missed it for a gcd or two because u were weaving more important skills, but now you have that 500 potency attack baked into it, creating a sense of urgency to mash it whenever its on cooldown and also giving you 2 mandatory extra buttons to press.
All that being said, the following are some changes that would give DRK his own personality and make some of those OGCDs worth pressing. It is what I call the Clutch Knight.
- TBN cd is increased to 25 sec but mana cost is removed. (still requires a skill check to use at full potential, because it needs to break for proccing dark arts. cd increased to compensate not requiring MP)
- Dark Missionary duration decreased from 15 sec to 4 and magic damage reduction increased from 10 to 20% (time it right and u get to be a hero. time it wrong.. you wasted the cooldown)
- Oblation duration decreased from 10 sec to 4 and damage reduction increased increased from 10 to 25%. (save that greedy dps from himself with a quick intervention, then let the healers deal with him. again, you need to time it right or else it's a wasted cd)
- Dark Mind duration reduced from 10 sec to 4 and magic damage reduction increased from 20 to 25% (simple change. potency increased to compensate for low duration)
- Salted Earth triggers the 500 potency attack from the new trait automatically and instantly when you cast it, leaving the aoe dot behind. (potency can be lowered from 500 to 350 to balance the fact that its less effort to use)
- Enhanced Unmend is removed and replaced with Assault Mastery (better name pending), reducing Carve and Spit and Abyssal Drain cooldown by 15 seconds.