I think Dark Knight remains a dead-simple class to play even at 70 and has been made boring, and that the fact that it receives its big ability that rather massively affects how it plays is only gotten at 70 now makes it even worse.

I think the developers should stick to their own words when they say certain classes are made more damaging or less damaging depending how much utility they have, and apply that logic to tanks because clearly they aren't doing that with the most utility heavy tank being also the most damaging one and the least utility one being down in the gutter because achieving its optimal dps is more difficult compared to the other two tanks.