Its important to know that while all the usual elements of a superhero flick are in place, this is a somewhat different kind of superhero film. Its also pretty dark( given that the Dark Knight series and Man of Steel were intense enough by themselves), and gradually builds up to a climactic conclusion.
Bruce Wayne( Affleck) might have a somewhat inexplicable grudge against Clark Kent( Cavill), and in his anger, he has to be reminded by Alfred( Irons, superb) that taking on Superman would be suicide. After all, how does one defeat a man who cannot be harmed by anything - except kryptonite, of course. So Wayne dons his cowl, a considerably up-armored suit and levels the playing field a bit, with the help of an array of special gadgets and materials.
Those aware about comic lore would know that these two have faced each other off before. But on the big screen, the fight sequences are furious. Its also about a clash of their ideologies. Its pretty heavy and this will put some off. However, Jesse Eisenbergs Luthor is terrific - from his look, to his mannerisms; a psychotic, conniving villain straight out of hell, who quotes Nabokov. Gal Gadot, as smokin hot Wonder Woman is absolutely kickass. Affleck is good, but youll definitely miss Bales Batman.
Characters are briefly introduced and there are certain scenes that might look random( Batmans nightmares, for example) but all reference the DC Universe. The movie is packed with references - both visual and dialogue-wise - to classic comic lore. Underpinning everything is Hans Zimmer and Junkie XLs score. An artillery barrage of action.