As i said, as long as you dont have crazy headshot / kills ratio ( for example: 80 kills which 78 are headshots with an m416 ) or 25% + accuracy with assault rifles, 65 % + with snipers, and 25 % + with LMGS you are fine. Also, try to keep your kills per minute at around 2/3 .. never above 4.

Those are the basic rules i've used over time and luckily never got banned. Let us hope it stays that way.