Reviewed by GREG KING Director: Roger Spottiswoode Stars: Arnold Schwarzenegger, Tony Goldwyn, Michael Rooker, Robert Duvall, Sarah Wynter, Michael Rapaport, Wendy Crewson, Rod Rowland, Terry Crews, Ken Pogue, Colin Cunningham, Taylor Anne-Reid. The first mainstream Hollywood film since The Boys From Brazil to tackle the controversial issue of cloning, The 6th Day is a spectacular looking, but ultimately …