When Australias max age rating for a game is 15 you knew this wold happen sooner or later.
The OFLC has said that the sci-fi action game contains, “violence that is high in impact and is therefore unsuitable for persons aged under 18 years to play. The finishing moves and most violent game play includes decapitation, dismemberment of limbs accompanied by large blood spurts, neck breaking spurts, neck breaking twists and exploded bodies with post-action twitching body parts. These moves are relatively easy to accomplish and once the player has mastered the moves and is able to get close to his foes, these violent moves can be executed.”
"Successfully shooting an opponent results in the depiction of blood spray. When Hayden cuts off his opponent's limb with the glaive, large amounts of blood spray forth from the stump and the injured person screams in agony which increases the impact."

Dark Sector is the latest game to be banned in Australia due to its content. Last year, sports game Blitz: The League was banned due to depictions of drug use, while shooter Soldier of Fortune: Pay Back was banned for excessive violence (Soldier of Fortune was later reclassified after content changes by publisher Activision).