I like the K/D stat always have, on games where it wasn't tracked back before, I used to work it out anyway...
However I would have it removed, or at least only have it visible in your own combat record...
It would take a load off my mind if before a game I couldn't so quickly and easily see everyone else's K/D as it does a few things, makes you assume this game is going to be easy, then get pissed when things aren't going as the numbers say. Or see someone who's better than you and assume they are going to be unstoppable...
I like it for personal use, but it would be better if I couldn't see everyone else's...