Everybody go into your Legend and click Crucible Medal Score. Scroll to the top and list the number of kills you have. Then scroll down ability medals and list the # you have for your supers, i.e.
Hunter: Way of the Gun and Gutted
Warlock: Space Magic
Titan: Cry Havoc, Blast Shield
Then figure the percentage as # of medals/kills.
I'll Start.
Titan - Cry Havoc: 5 medals
Kills: 3713
%: 0.13%
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The medals don't really prove anything. For instance, as a titan I once killed a entire team with one smash. That is one medal. Not a very good way to show your point.