What levels are you guys at?
I'm a colonel service star 7.
http://battlelog.battlefield.com/bf3/soldier/Kharekatoh/stats/355178912/
I have higher accuracy on a 360 controller 
this game is so much easier on xbox... so a 2 KD is easily possible as is a higher accuracy, play PC with no aim assist then see how it goes.
Ive got it on both pc and xbox i use xbox pad on PC ( cant do keyboard and mouse as i dont have a computer desk
Have you ever played a PC FPS with mouse & keyboard? That combo is so much more accurate than a gamepad with no assist. Point taken about auto-aim on the Xbox (however it is minimal), and you can still pinpoint shots more accurately on PC (coming from an ex PC gamer)
A KDR of 2.0 on Xbox is easily possible? Well actually it's quite difficult, here's why:
1. My KDR of 1.95 is in the top 7% of Xbox players.
2. Think law of averages. The
average KDR for all players in the Xbox BF3 universe
must equate to 1.0, as for every 1 kill there is always 1 death. (Realistically it may reside just below 1.0 when you factor in suicides, i.e. more deaths than kills).