I like karma - gamification is fun, humans like watching number go up
I think the answer is to localize it. Maybe community/server based, maybe make it bleed off with time, maybe do all of these and use statistics to come up with a way to make the metric useful somehow
What we don’t need is karma done badly, and there’s a lot of far more important things to worry about first - I think we should put it way on the back burner and wait for an elegant proposal for how to handle it