Difficult to answer but I'd say no it doesn't matter, it isn't an accurate representation of skill level. It's merely a kills to deaths average. I'm a Voidwalker, I often play extremely aggressively. Getting in my opponents faces and blowing it away with Invective or trying to get to a spawn/ammo drop and blowing up as many as possible. I play my Voidwalker kinda like a juggernaut, I'm going to rush and kill as many people as I possibly can and if I only trade with one person so be it. Now that being said, I do play smart and play objectively. I try to get at least 2 kills for every 1 life. But even then if I see a chance to stop my opponents plans by blinking into a situation and causing havoc then so be it. The Striker is the same way, I trade with Shotguns so many times because I'm trying to shoulder charge them. Other days I play conservatively. I camp, and wait. I hold choke points and aid my teammates. This leads to great K/D but in the long run is rather boring. In the end I think people put too much stock into K/D and if you're a 1.5+ you're obviously doing something right. But if you're out there having fun and helping your team win that's good too. My best advice would be as others have said, play smart. Try not to do anything stupid and die needlessly. But other than that have fun.