I think the "gerrymandering-ness metric" you are looking for is called the "Efficiency gap". The problem, of course, is getting everyone to agree what the acce

I think the "gerrymandering-ness metric" you are looking for is called the "Efficiency gap". The problem, of course, is getting everyone to agree what the acceptable range is for this value, and to make it the law. https://en.wikipedia.org/wiki/Wasted_vote#Efficiency_gap https://en.wikipedia.org/wiki/Wasted_vote#Efficiency_gap