Exactly.
I care very little about K/D. I think my KD is something like +1.5. But my ranking on CT/globally is high, because I play the game as intended.
I'll be organizing a rush and leading it (being first to die many times lol), or out healing tanks or even charging a vehicle into an enemy rush, knowing I will die, but at least disrupting the incoming attack. =D
But I do understand the value of a high KD player.
I think basically all roles on the team necessary, just some more obvious than others (a sniper getting 100+ kills is more obvious then some dude healing a building the entire game)