Maybe what makes DK much more irksome is how we are restricted on our deck building choices (for max score) at Guild War battles wich limits some options of how to deal with him.
I’ve used Maw today and i hadn’t another option but to kill DK with skull damage, and even if i could get a free turn chance to get rid of Death Mark i would risk losing a troop or three troops at least the same way, becase the only brown troop with Cleanse is Emperina and it’s single targeted, but to use her i would need a whole new setup… And if i would opt for a mass cleansing effect i would again incur on some points loss because of the restriction of using all Brown troops today.
Sure, there are also more ways to deal with DK that i hadn’t thought yet, or maybe i won’t just share it 
…
So is it really worth to have such troop that adds more trouble to GW?
I think people are already unsatisfied with enough stuff, and DK’s trait just fuels the whole thing with more frustration.
On a side note everytime i see/write DK here i think of Donkey Kong…