It's not really fun, especially compared to all the fun stuff you can do on prot wars.
It sucks having no panic heals like death pact, or a way to reduce a lot of incoming damage at the beginning of a large trash pack so you don't get destroyed before you gain enough RP to death strike. Having JUST vampiric blood is quite boring too. I still don't like the feeling of having to create resources to death strike, makes me a little anxious having to spend time doing that while I'm getting rekt. I don't trust healers to know that I'll take a bunch of spike damage until I get my shit together if I'm at no RP.
Well the artifact doesn't change much, but it does erase the threat of being killed when you pull a pack of mobs. With just several targets it's pretty much LoH on a 45 second CD. After you're rolling, boneshield lasts long enough to transition to another pack, not to mention you'll probably have some left over runic power.
As of now I pretty much enter my first pull of the instance (or a boss pull) with DRW just so I can get high stacks of boneshield ASAP.
Despite a lot of complaining, I still feel blood DK 'plays' better than all the other tanks, and that's not saying much because I don't think blood DK is the pinnacle of fun right now either. I find DH tanks a bit more boring than blood honestly, with the only enjoyable aspect being the mobility (and yes, I'm talking with all talents).
I personally feel like they have done a great job with the class fantasy of all the specs especially blood this time around as a DK main since launch, just hope they keep an eye on Frost tuning so it doesn't lag behind Unholy too much.
It seems that many people like the changes but I agree. I didn't really mind WoD changes especially with rune tap being a 2 charge amazing CD. But they just removed a lot of our active mitigation making rune tap a talent with better options on the same row and just straight removing IBF. So what our best CD is now Vamp blood?
It's like they took all the responsibility for CDs out of tanking. Stack boneshield, use heartstrike if high boneshield, use and stand in death and decay. Use deathstrike after taking damage or if risking capping on RP, blood boil to apply diseases/aoe/make sure not to get to 2/use if nothing else to cast. The whole rotation is so basic. The only form of choice is whether to cast heartstrike or the other ability which I cant remember the name of. I blood tanked every expansion since ICC and I think this iteration is my least favorite.
Playing Vengeance DH right now it feels exactly the same as Blood DK just with new abilities and names. I got empower wards instead of AMS. Im shearing instead of hearstrike/marrow im casting immolation aura on CD like usually what happens with blood boil now or damn near it. Soul cleave to heal. Blizz has gotten really boring with tanks.
The fact that you chose to base your opinion off of the prepatch instead of max level with your artifact, and your full list of abilities from the artifact is quite hilarious.