I think that is our primary disconnect.

When it comes to the tanks, I don't care much for the potency. I care about impact. Thinking on it further, that is the bigger sin with Reprisal compared to Low Blow. The impact isn't noticeable. It's a Dark Arts hit, and a damage debuff, but if the reduction doesn't save a healer GCD or prevent a death, it's not all that different from a Veil that breaks but you're still at 95% health.

I am an old mind tank. I'll play the tank they want me to here, but I wont' like it.

I won't lie and say big numbers don't get some childish glee (Black Mage For Life) but in this regard, Scourge fails. Because it's a DoT. It adds up to a big number, sure, but ultimately it's just a lot of little numbers.

Honestly, bring Scourge back as a 500 potency aoe Weaponskill that costs like 500 TP and I'll take that. If you found it fun to be a Cleave tank, then by golly, I'll sign off on that. The animation lines up for it, and it gives Dark Knights a TP dump between Blood and MP dumps.