First let me tell you it is not a Justic league type movie. Justice league is also come in 2017 juat wait for it.
I tell you, if you are a big fan of both Batman and Superman must watch this movie.
Batman and Superman both are most famous superhero in the DC comic universe and both are way different from each other, like Batman is intelligent amd known as sherlock holmes of DC comic and where as Superman he is kind and powerful. But at some point both disagree from the way of working and the this not workout between both of them and they fight.
While you se the movie Man of Steel which is Superman movie, in this movie fight between General Zord and Superman destory almost both Metroplois and Gotham, the fight between both of them also destory the Bruce wayn Wayn tower and almost Gotham to which is not acceptable for Bruce and he turn down to reborn Batman to fight with Superman for what he has done.
Their is not only Batman and Superman in the movie theur is also Daiyana prince aka Wonder women which help both of them to fight with Dooms day. For your informantiom Doomsday is new verison of General Zord and he was made by Lex Luther, which is a billonier, playboy, scientist, philentropist and much more.
Now according to comic Doomsday once killed Superman but their is not any type of thing is shown in movie. Movie have action and much more to learn from that, the movie is not totally based on the movie but watch it
Once for a last tell me Do you bleed.