I've practically now given up on KD in favor of ranking up super fast on Hardpoint. I die too often on that mode to begin to care about ratio. I'm getting 10k xp per game on average at the expense of dying a few more times than I'd like to. I don't even think I got half of that amount of xp on TDM per game.
I'm almost to this point. I don't want to feel frustrated if my K/D goes down.
Be polite, be professional, but have a plan to kill everybody you meet.