I don't know if that would be a good metric, with public zones and adds farming at the boss possible. I have a few regular destiny teammates, and they can end up with 20 -25 kills in a strike. It's not that they aren't participating, I'm just more efficient at killing minions. and I have gjallarhorn and heavy ammo synth. I've played with randoms that are the same way, especially if they aren't "speed runners". Vote kick system would need a lot of restrictions to not be susceptible to abuse/trolling. Hard to see a perfect solution for this. Mass effect 3 had the same issues. They reduced the timer for auto-kick quite a bit, but then people just rubber-banded their controllers or went suicide each time they spawned. At least that game didn't have enemy health buff based on number of players.