Sony’s downward spiral isn’t being helped by its PlayStation Vita portable game console, which is being pulverized by its primary competitor, the Nintendo 3DS, in the electronic giants’ homeland. Last week the Vita sold just 4,201 units while the Nintendo 3DS sold 187,077. The PS Vita’s lack of compelling content could be the main culprit. “The Vita had no new releases last week, and none of its games appear in the top 30 chart. There…"Sony’s PlayStation Vita console is not doing terribly well in Japan"