There's no reason to ever play a DK when Warriors do everything better. Warriors are even going to be better in 6.2 along with Assassination Rogues and Wizards in general.
I'm getting really tired of the pvp community and Blizzard ignoring DK's by keeping the class in its never ending state of just being a damage bot with zero utility, zero team support, almost zero ways to peel ect. It's like nobody gives a shit because for some reason everyone is still stuck with this insane idea that DK's are somehow "fine" when in reality the class has been overall the worst class for quite some time.
Playing a DK is like playing a poor mans Warrior. I don't know how many times I need to repeat this but its true. It is the worst designed class in the game. DK's have to sacrifice everything important for just high sustained pressure and overpowered self healing in 1v1 scenarios. It's great to get 100k Death Siphon heals on PTR except it doesn't actually matter in arena or any team setting where pure healers can do the healing part for you.
6.2 will be the nail in the coffin for this class. It's a class still stuck in season 9 design when its 2015 and other classes have evolved.
I would like to see them change the class. I would like to see some kind of Necrotic Strike mechanic added back in to counter act the fact that DK's have no MS. I would like to see them do something with Death Gate and make it similar to Warlock Portal. I would like them to buff Dark Sim and make it a core mechanic to the class. I would like to see the entire Frost spec redesigned where it can actually scale normally with stats. I would like to see the level 58 talent tier completely redesigned where the class doesn't have to sacrifice it's entire mobility for a stun. I would like to see Icebound Fortitude/Desecrated Ground/Lichborne less idiot proof.
But instead what I get is just the same old shit. Same old shitty class with the same shitty abilities that are completely based around playing like a complete retard. Mash pve rotations while mindlessly smashing anti CC abilities to maintain a brief period of retarded uptime only to get shiv slowed by a Rogue and re CC'd by a Wizard anyway.
There's no joy playing this class even when you win because even when you do win, you never feel like you actually outplayed or outsmarted anybody. It's depressing and its no wonder any actual skilled player never wastes their time with this class. You want to know why almost no high rated streamer plays a DK? Here's your answer.