I have a saying to myself, "Kills don't win matches. Flag Control/Denial does."
20 kills is only 60 points. That is the equivalent of holding holding 1 Flag for 3 minutes, 3 flags for 45 seconds, capturing flags from others 3 times, or killing 3 drones.
I've had matches with hideous stats, but the rest of B knew we won because I sat on the OP flag protecting it from Ninjas while they were Mid or supporting elsewhere.