Not necessarily. While its folly to use it as an insult due to no one having a single clue what sort of life anyone else lives, there IS a segment of the player base that, quite simply, doesn't have the same amount of time to devote to the game. A single dad who works full time while also taking care of his kids and has a 0.8 K/D has a legitimate reason. He doesn't have the same amount of time to devote to improve his game. A high school student who has a zero major responsibilities and ample time to practice and play will usually have a higher K/D simply because he does have that time.