I find that in a massive furball, you can't help but kill people when they don't notice you. I wouldn't call it cherry picking, but you're in there twisting and turning, dodging and killing, and you will frequently see some guy turn right in front of you onto one of your countrymen. That's an opportunity kill, and I'll never pass one up, but it is obviously unfair in the sense that the other guy never sees it coming. If he did, after all, he wouldn't have turned right in front of me.
In those cases, I do think situational awareness and the ability to adapt quickly inform one's ability to "cherry pick."
-- Todd/Leviathn