Review: Batman v Superman sets up a Justice League we don't need

Superheroes these days seem to spend as much time fighting each other as they do saving the world. No Avengers is complete without the obligatory internecine throw-down. Captain America: Civil War finds Steve Rogers trading punches with Tony Stark; the X-Men are always squabbling. But, of course, Batman v Superman: Dawn Of Justice is the daddy of all spandex wrestling bouts. The Dark Knight v the Caped Crusader; wits v brawn; man v god. And holy cash-ins is it ugly