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@Cynamooo: Kill aura is still just as deadly as before. It's even deadlier if paired with bhop or a speed hack since the victim won't have enough chances to land returning hits. I even saw a diamond rank hack on SG with his kill aura.
It depends on kill aura settings. If it's 1.8 style kill aura in a 1.9 PvP setting, then it'll shove the player a lot and even do major damage, though not as much melee damage. If it's 1.9 style and paired with movement hacks, then it's worse.
A lot of Valve games and others do a "first offense = permanent ban" system. This is what servers should do against cheating for a good zero-tolerance hacking policy. Cheat = ban with no appeal.