My biggest gripe with DRK is the leveling process. They really need to introduce a weaker version of TBN for the early levels and have a trait that upgrades it at lvl 70.
Dark Mind is not a cooldown in most dungeon content and it really sucks to have a mitigation tool that is only used in the very high end content.

Sure there are other issues with DRK but the issues above affects most of the new player experience with DRK which was ok at launch and during SB, but seems to have been forgotten about after the reworks.