Quote from Adumnin >>

Personally, I think it's either Deathstalker Rexxar and Shadowreaper Anduin, simply because Bloodreaver Gul'dan needs good demons to be good, and Frost Lich Jaina needs a couple more elementals to work, and I'm rating these based on individual strengths, and Build-A-Beast really can't be out-valued, and Voidform is very useful. So what do you guys think (I didn't put in a poll since there weren't enough answer slots)?

 I can't disagree more with this statement. Gul'dan is by far the best DK out there. The hero power is 6 hp difference every turn. That's the reason you see him being played in every warlock out there (even if it revives only a couple 4/4's without taunt or anything special). The hero power is just THAT good.

On the 2nd place I will put Jaina - because the Lifesteal she gives to all elementals and the ability to generate more of them make her very hard to deal with if you are not a combo deck and the opponent drew her in a timely fashion.

Rexxar is only good if you can't get control of the board and let him get tons of value out of his hero power. But for him to do that - he is basically limited to hero power + play the zombeast. So, if you can single target remove the beast and push dmg to the face he will be forced to pick some suboptimal taunts just to survive and if you repeat that for 1-2 more turns - he is usually dead.

Anduin is okay, but no way near his past glory of the unnerfed Raza. The hero power is good for finishing games with 2x Mindblasts and 3x Hero powers for 16dmg, but all those druids or warriors or big spell mages can easily get out of this range, so he is no way near the power level of the other 4 dks - the 3 mentioned above and ...

Hagatha - in my opinion she is on 3rd place, right after Gul'Dan and Jaina, just because her hero power is a passive and does not require mana to activate. So, you can play you minions and get those freezes or removals for the enemy side of the board. Or some BL or Windfury to close the game if some minion sticks. The 3dmg AoE BC is also a nice board clear which compensates for her high cost.