I am fervently hoping that the savage tier continues to use damage down; it was refreshing to see DPS actually care about doing mechanics properly.
Though I admit, I actually rather liked the Delubrum Reginae "Twice-Come Ruin" (or the savage variant's "Thrice-Come Ruin"). It was forgiving -- screw up a mechanic and you were put on probation rather than instantly vuln stack'd or damage down'd. But
repeatedly mess up a mechanic and you just plain died. No "the healer should've healed me through this", you just get Doom and you're gone.
It was like the perfect combination -- to my taste, at least -- of forgiving ("Okay, you screwed this up once; you're on probation, buddy") and unforgiving ("Welp, you die now.").