Sometimes I feel like I remember peoples nicks and I think it would be cool to be able to see a player versus player stats. Like if you click on a player in waypoint you can see how many games you played together and be able to see the win/loss ratio. This might be impossible but I’ve seen it added in some games.
Check out halo5arena.com, it doesn’t track your pvp all time (to my knowledge) but it does in a game and series (i use it to follow pro scrims). Really awesome tool. I can’t advocate it enough.