[ConcreteRancor]

I think they may be picking the games they are because they're looking at the violent games that they also see as being extremely POPULAR. That would justify Halo 2's inclusion, as well as Doom 3 and Half-Life 2, while having some reason for leaving out Painkiller and Far Cry.

Although the inclusion of Gunslinger Girls blows that theory out of the water and possibly into orbit, so really I have no idea what's going through these wacked-out minds.