Me, Sean and Kris had a few games at the weekend. My D/K ratio must of been about 5.0!
Oh and people on the PS3 & 360 both suck, unless they use a keyboard and mouse of course.
I believe certain things you can unlock do not get kills with such as chopper gunner, not entirely sure but only two of my friends have got tactical nukes so far, apprently everyone hurls abuse at you after the game for ending it
Harrier > Pavelow > Chopper Gunner.
I usually get around 10-15 kills with a Chopper Gunner.
Oh and I'm prestige now, woo.