I don't think you can value the MWO stats like you can with other games like BattleField because of the game pacing.
Getting a kill doesn't require skill. I can't stand that when I'm in battle I think about my K:D ratio while it is an stat that means even less then nothing. The only thing you need to get a kill is to be the one that fires the last shot at a mech.
I had enough situations where I was fighting multiple mechs or a good one on one and after a brutal fight I didn't get the kill because some teammate walks in and fires an (insignificant) weapon that makes the kill. There are no stats in this teamgame that can justify your worthiness.
Damage done/game: when you're a sniper elite killing mechs via headshots you do little damage. Also if you destroy the arms, torso and one leg of an centurion/hunchback/awesome you do a lot of damage, but it is useless when it has it still has his center torso/head lasers and kills off everyone on your team.
Assists: Just do 1 point of damage to a mech and you'll get an assist.
Deaths: What if your PUG/team gets whiped out within 2 minutes because everyone is running to a diffirent direction? You are destined to die. Alternatively you can go out in hiding so the enemy can cap your base, but I don't do that, I'm here to fight even when the odds are against me.
A nice stat would be average playtime per match. Having an average playtime of ~3 mins means you are a fast capper or get killed verry fast. This would be the most valuable stat in my opinion because the latter is a worthless player and I haven't seen that many games with a fast cap.
A better kill stat system would be to award the kill to someone who has done the most damage to a life critical point that makes the kill like: the head, the center torso or when it had a XL engine the side torso's.
So unless they implement something like that/change the stat system I hope that this feature will be the last thing they'll work on.
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[color="#b27204"]BladeXXL[/color]
Thats kinda traffic intensive for a stat signature unless you'll update the pic once every xxTime instead of on demand.