I’m pretty new to Dk, but once I get it rolling, I really love all the DND cleave. I also use a macro that casts DND/defile at my feet, and another on a different keybind that does @cursor. That really helped smooth things out for me.
Granted I am but a wee casual and have not really stepped into M+ yet (lack of interest, mostly) but I like the defile build for unholy in raid too.
I think the only complaint I have is sometimes during ad phases, by the time I’ve set up and I’m ready to start tearing into mobs, they’re around half hp or less and I don’t get to really pump as much as I feel I could have. I’m getting quicker though, fight familiarity has helped me there more than anything; being able to plan out when and where to drop it is pertinent.