Like overall dps rotation and mechanics, DRK plays like shb DRK in my particular case I enjoy it. But as said its pretty weird that Blood Weapon and No Mercy didn't receive Delirium and IR treatment?
My complaint for Shadowbringer is the sound effect and animation for something that is like your "ultimate" doesn't have a impactful visual like compared to Primal Rend.


Now for defensives they feel really uncomfortable to use, its like several spread defensive cds where I have to bake it into something during fight and they don't feel a efficient compared to the other classes.
Dark mind works really well for this Savage line up given the bosses use magic TBs, but in general I feel like I'm rotating between TBN+ Shadow Wall and then for the next TB TBN+Dark Mind, making oblation really niche unless I plan to clip my OGCDS and add oblation to it. The times that I use it "comfortably" is when someone do a bad move and take a lot of damage before an high damage AoE from the boss, then I apply both Oblation and TBN to the person, but the principle of it usage its a mistake not something you plan for.