For a reason I don't full understand, Australia's game ratings board is notoriously strict when it comes to objectionable content. You may recall that "Left 4 Dead 2" was refused classification by the board two times before an edited version was finally approved and released as an MA 15+ game (mature, for ages 15 and over). Having played the unedited version of "Left 4 Dead 2" that released in the States, and having spent a fair amount of time with preview builds of "Dead Rising 2," I was a bit mystified that the latter was approved without argument or editing. But it was, and now I know why. The zombies in "Dead Rising 2" totally look like zombies.
The second rejection of "Left 4 Dead 2" in Australia was met with the following response from the Review Board:
"…it was the Review Board’s opinion that there was insufficient delineation between the depiction of general zombie figures and the human figures, as opposed to the clearly fictional 'infected' characters. This was a major consideration of the Review Board in determining the impact of this game on minors."
Basically the zombies in "Left 4 Dead 2" might have been normal humans that were just having a really bad day.
The zombies in "Dead Rising 2," though. Those are zombies, through and through. They shamble. They groan. They eat brains. That's my kinda zombie!
It's a bit ironic that the Review Board had issue with the human-looking zombies of "Left 4 Dead 2," but didn't have any qualms with the human-on-human violence of "Dead Rising 2." I guess so long as you don't chop 'em in half, it's a-ok.