So I know on paper this SA looks really, really bad. I'm going to say though, weirdly, as someone with a maxed out Neuromancer, it may actually be less bad than we think? Because with Neuromancer, all the damage I deal seems to be scratch damage, I'm guessing because they're tagged out, or because it's just not enough damage? And does it heal back fast? It really freaking does. I'll kill someone with a BB3, kill their partner reasonably fast, and is the next person still damaged? Maybe just a little.
We'd need to test out the rate though, and it'd still be something to never use in current Rifts which is where the margins are so slim.
Also, Neuromancer does 15% damage on a good day, usually once per match. Mummy Dearest does 20% maybe multiple times. Just an interesting data point though on how hurting people behind the front line seems to work though.