Dk is VERY strong here because of improper scaling of Necrotic Strike, along with other abusable bugs such as Presence shifting in dual specs.
Haste is not supposed to affect DK dots at all.
Gargoyle hits anywhere between 10k and up to 80k(but only Pujo does 80k, it's obvious why).
Blood Tap, altho bugged, is still better than the other talents in the bracket because it's the only on demand death rune button and not something based off RNG.
DoT damage is also nice, but most complaining about their damage are the ones who stack full critical strike, instead of full strenght, for Soul Reaper ganks. If they stack full strenght, DoTs are doing regular/intended damage. If they are still too low, they shouldn't be touched untill the Necrotic Strike issue is resolved.