K/D actually proves ALOT in COD. You want to talk about winning? COD is a game centered completely around killstreaks which mean that the team that earns the better killstreaks (usually regardless of mode except S&

and maybe a few others) will always win. Objective this and objective this and etc etc. no. To be successful AND TO WIN in COD you have to earn K.S. continuously. If your team does not earn spy planes or UAVs and etc while the other teams has constant UAVs and spy planes up, it does not matter if your entire team tries to capture a flag or hold down a site, you WILL LOSE.
By the looks of this thread most of you are saying "OMG, IDC abt my k.d, i only care about winning", Yea, pure b.s. I have not met one person who does not care about their k.d., even to a minute amount. The higher your k.d., the more k.s. you earn and the more AIR SUPPORT you have, the more games you are going to win. Plain and simple.
Whos going to win a match when a team full of 2.0k/d goes up against a team full up .5k/d in domination? demolition? tdm? sabotage? headquarters? The team with the 2.0k/d obviously. Why? Because they know how to get k.s. which will help them win easily. a person with an average k.d. of 3.0 will get you a spy plane at the very least on each of their lives while a person with a 1.0k/d may need 3-4 lives to get one. Which one will have the upper hand in a match? Which one will help his team win because of air support?
Obviously, k.d. isn't the only thing that is important as a person going solely for K.D. is not the best player to have on a team. However, I would prefer a guy with a 2.0 or 3.0 on my team any day over the random person with a below 1.0kd. Why? Because the person with the 2.0/3.0 is gonna have a spy plane or Blackbird out in the match as a guarantee which means I am going to get my spy plane/blackbird which means our team is probably going to win.
The best way to judge a person is to compare their K.D. to their W/L. You will RARELY see players with a 2.0+ W/L with a below 1.0 or even 1.5 K/D. Why? Cause good people help their team win no matter what they do and people who aren't that good are going to help their team lose lol.