Can we get this for all content?

Its a good way to see where you stand in terms of gameplay, Shows you how well you played in comparison to the rest of the people in the activity.

Seems like a legitimate way to get better at the game, Self improvement is something everyone should work on.

If anything, add the 'Commendation' system into this, so you can just click a little + next to somebodies name if you think they performed well.