Silent Hill: Homecoming focuses on violence to rid the world of evil horrors by way of "ramming pipes through enemies' heads and stomping on their faces to pull them out [and] tearing their entrails loose with an axe," as described by Edge Online.
The crux of the issue stems from the OFLC rating standards which currently has a peak rating of 15+ for games, despite the fact that movies and magazines can be given an adult rating (R18+). The Australian government, which maintains the rating system in the country, has said they are looking into adding an adult rating to games but have yet to implement any changes.
Silent Hill: Homecoming will join System Shock 2: Blood Trails, Dark Sector and Fallout 3 as the only four titles to be refused classification in 2008, although the latter two titles were eventually released in a modified form to meet the rating standards. Silient Hill: Homecoming hits the Xbox 360 next week in North America followed by a November release in Europe.
Simply put, Germany's video game rating board is strict. They're the same group that refused to give a ratings to both 
