It's interesting people bring up metrics.
You can't quantify cohesiveness, adaptability, versatility, presence and other intangible factors. Using K/D is not always the best option.
Is it a metric? Sure.
Is it the main metric? Debatable.
I remember people mentioning K/D's in matches and I would always have the same response: That is irrelevant. What matters is the effectiveness, overall, as a unit. Often times you need to actually take that death to give your team two kills, and while some would think that you sitting at 1-3 means you're not the most influential for those three rounds, in reality, your trading and overall game sense is what frankly gave your team those rounds. It's a very out-of-context statistic that I think is very inaccurate in measuring quality of a player.
What's most interesting, to me, isn't individual stats or even "who" is the best at X, Y or Z.
This is a team based game. What's more interesting to me, is what team had the best infantry core? Ranged? Cav? Which had the most innovative playstyle? Which was most adaptable? Most aggressive? Most passive?
I think people make a lot of accurate points here. One that doesn't seem to be really getting very highlighted is the "power vacuum" point. Imagine you have ten teams playing basketball, and you have ~4 teams that are clearly the top level with the rest at the bottom. Eventually, three of those teams are gone and you then have the one team from that original top tier attracting all the free agents and players from other teams because there's no competition about where the "place to be" is if you want to be successful. If I have learned anything from leading a clan in both Darkfall and Warband that were, without any dispute, the best at the time we played, it's that people are attracted to success. Most don't want to work for it, most don't want to show up and put in the time and build something. But when you build something and you start doing well, when you make it to the top of the mountain, everyone wants to jump on with you and share in that, even if they didn't exactly deserve the spot.
It used to be ridiculous the amount of PM's I got every day from people I didn't even know, begging for a chance to tryout. My response was always the same, I eventually wrote it out in notepad and just copied and pasted it to them: "We don't recruit like that. I appreciate the thought and intention, but if we're interested in you, we'll come find you. Building the team slowly is more important than grabbing up a lot of people who may be good and throwing them together."
I'm sure other teams had people coming to them as well. However, eventually, when there's only one place to be, you find yourself in a drought of viable opposition. I've always held to the idea that when you're attracting people, you're doing something right. You can't be faulted for it, and in no way is that the spirit here. But it is an important consideration to remember that not only are results important, but so are the context of those results. Boxing a man with no legs and only one arm isn't exactly a victory, while losing to a world champion isn't exactly a loss. Context is important, and I think that's what gets lost in translation.