One thing I can't stand seeing is 15 guys giving "wtg's" for someone "landing" TWO friggen kills.
Maybe it's a new player who's making an effort to learn to fly and fight properly and that's the first time he's ever landed 2 kills without HOing, spawn camping, etc. Why does it bother you if he gets a pat on the back?
I'd leave it on, but it doesn't make much difference to me. It really doesn't motivate me, and to be honest I don't pay much attention to it. K/d ratio is the only stat I really care about, and that only in fighters (although I do wish they'd separate tanks from other GVs). It's the only real benchmark I have to go on, and it provides a motivation not to just bail as soon as I've dropped ords, run out of ammo, been damaged badly, or what have you. That just seems weak to me unless there's a good reason for it.