Woah. Either of two things are happening here:
Aussie servers are lucky, and have no hackers, yet all the servers around the world are filled with them.
You are all just bitching because you get killed often, and, ofcourse, anyone who kills YOU must be a hacker to be THAT good.
I'm pretty sure it's the second option. Grow up. You are not invincible. There's always going to be players with a better gun or attachments to suit the situation. Every gun has it's good and bad maps. And sometimes there are opponents who you will just never kill regardless of what class or firearm used. I have never seen a hacker, not once. I've seen lots of 50, 60, 70 kill counts (some of my own), but I've never seen a hacker once. You gotta remember some players spend hours online each day. Through time and practise you get better at headshotting, precision grenade throwing, quicker knifing, smooth weapon switching, and better at knowing what routes to take through a map.
Moral of the story: If someone beat you in backgammon (IRL) 10 times in a row. Would you call them a hacker? Or just realise they are BETTER THAN YOU.