I never understand why anyone even cares about k/d ratio in this game, I don't know I only play Rush, you get your squad together, get to the objective set the charge, guard it and if you die or get kills it doesn't matter as long as the thing blows up
If you're a defender who cares how many times you die as long as the charges don't go off, and if you're an attacker a kill is worthless if you don't win
That's just how I play anyway