Earning points for kills without deductions for losses has always seemed dumb to me. Yes, I know you have k/d ratio for those that care, but it has no REAL bearing on FFA. In team games at least deaths still hurt your team in the overall picture.
A better way to score COD IMO would be a +/- score system. For example, 21 kills and 10 deaths would be a score of 11 (21-10=11). This way the score would more ACCURATELY reflect the players TURE ability. Just my opinion.