I think dice might have pushed it a little to far with this one.
Get a nemesis kill, sounds easy enough, HA!!!! Kill the same person 4+ times in a match, not so easy. I figured play games with small teams where they have to converge on a single area, 40 person ops or 20 person rush. Either the enemy must come to me when I defend or I come to them when they defend. Even then the matches were so quick I was lucky to get two kills of the same person.
I personally don't care about the medal, it was just something new so I bagged the mission but I bet there's some near empty severs right now with some boosting going on.