Marvel’s Guardians of the Galaxy, which starred, among others, Vin Diesel, opened with the hero of the film being put out by his enemies not knowing who he was. An inflated sense of ego. A similar feeling occurs while watching xXx: The Return of Xander Cage, directed by D.J. Caruso, except this time it’s the audience who are left wondering why should they know – or care – about the resurrection of a character who’s first cinematic outing was fifteen years ago. There were kids in my screening that weren’t even born fifteen years ago. The extreme sports angle of…