dtgreene: If it's kills divided by deaths, then what's the score of someone who has never died?
It would be however many he/she has killed. A better way to think of it would be kills per life.
For example 10 kills, no deaths would be a score of 10. Average of 10 Kills per life.
And 10 kills, 1 death would be a score of 5. Average of 5 Kills per life.
10 kills, 2 deaths would be 3.33. Average of 3.33 kills for every life.
You see what I'm getting at?