I've just always been somewhat shocked this generation that joe (american) six pack walks into Wal Mart and chooses 360 over PS3. Not being sarcastic, I really am. I would think that just "playstation" branding would be the deciding factor for most J6packs.
Americans have been pro-Xbox since last gen. Nothing is cool about the Playstation brand in the US. MS has had the core 14-24 group locked up since Halo 1, with marketing that includes Axe body spray, MTV, Mountain Dew, etc.
Sony's only hope is to take off in Japan and Europe with a big price drop next year. They can hope for decent NA sales with a price drop and KZ2, but nothing will fix the branding and anti-Sony bias they have here.