NBC Cancels Heroes

To be fair, this one had  been coming. Ever since its first season, Heroes has struggled  to get back to anywhere near the same standard, and when season four  petered to an end earlier this year, most assumed it was done.For NBC, the high production costs and the dwindling ratings were  clearly major factors. Yet nonetheless, just as ABC did with   FlashForward,  it toyed with the idea of a