Zombies are people too (but that doesn't matter)

Despite EA's attempts to clearly show the differences between Zombies, Infected and Humans in Left 4 Dead 2, the Classification Board was not moved in favour of granting it an MA15+ classification.

EA argued that the game's violence was "unrealistic", the main enemies were "zombies who were not and never had been human" and that the "zombie killing was an ancillary component to the central objective of the game being played online and in multiplayer format"

In the Review Boards report, recently obtained by GamespotAU, it was mentioned that there was "insufficient delineation between the depiction of the general zombie figures and the human figures as opposed to the clearly fictional 'infected' characters."

This wouldn't have mattered anyway, as the Review Board went on to say "whether the objects of the violence were fictional or real, and whether a 15 year old could discern the difference, is largely irrelevant where the game displays the level of realism this one does."

Gamespot also mentions several instances of "high impact" violence occurring in the game, the reason behind the RC classification.