I've not seen JUSTICE LEAGUE and I don't plan to, but that doesn't stop me from reviewing it because these kinds of movies are so predictable you don't even have to go to know the story.
Lock the doors, Martha-- because Superman is dead. Dead like Jacob Marley on Xmas Eve and the world mourns the loss, because despite the fact that in the two movies we've seen him in through this DCCU (that's DC Cinematic Universe) literally BILLIONS of dollars in property damage and thousands of lives have been lost in no small part due to him and his actions.
The world is not safe without Superman so Batman, who used to be a cold hearted not afraid to kill vigilante until he realized he and the big red Supe had mom's with the same name (not the same women mind you, the same NAME) and that Supe's sacrificed himself for no other reason than to give us a World Without A Superman for half a comic book film, is now born anew-- he's now ready to pick up the mantle Superman has left behind and fight for good.
There's a scene where Alfred talks to him about retiring and living his life in some coffee shop with Selina Kyle who hasn't even been introduced into the DCCU yet but who's really paying attention anyway-- and Bruce can't-- not with the sacrifice Superman made. He has to assemble a team, like Tony Stark did with the Avengers and hey, that movie made like a Billion dollars.
Bruce's team consists of Wonder Woman-- who can pretty much do anything Superman can and she's a lot prettier doing it, Peter Parker as The Flash and a homeless guy as Aquaman who is King of the Seven Seas and ruler of the world's oceans. Why would Aquaman leave his kingdom? I'm going to assume there is some kind of threat that includes the oceans so he agrees to come along. There's also Cyborg because we need a black guy in the movie and DC Comics doesn't have a lot of them, I guess Black Lightning was out getting ready for his own film. Black Adam was available but two problems; he's a bad guy and he's not black. I'm not sure why they didn't go with the obvious choice of Jon Stewart's Green Lantern who was actually in the Justice League at one point. Cyborg is one of the Teen Titans and maybe they're hoping to tie in a film version of that team somewhere.
It's tough to get the team to come together but after an hour or so Superman is going to come back from the dead and join the team, we knew this because he's in all the posters like the marketing team forgot he was dead. He comes back at the right time too- because the fumbling Justice League is facing total defeat when he suddenly returns saving the day.
The villain in the film is Steppenwolf who is not an aging rocker as you might surmise, but a minion of Darkseid who is a much cooler villain and probably played by Josh Brolin who would have been a much better pick for Batman since Ben Affleck looks bored out of his mind through the whole movie and seems to be wishing he could be off somewhere groping young starlets.
The JLA eventually defeats Steppenwolf but it's not the end, because believe it or not this colossal pile of donkey doo is actually Justice League PART ONE. Yup you read that right-- PART ONE. I wonder how they'll explain Batman not being in Part Two because I really doubt Affleck will be back.
Anyway, JUSTICE LEAGUE PART TWO: WE MADE IT DESPITE NO ONE WANTING IT will be out in two more years and we'll have all our questions answered like why does there even need to be a Justice League if Superman can do everything they all can do and better?
I've read a couple of reviews for this from people who have actually seen it and my favorite so far is this one;
“I’m sorry that everyone wasted their time and money making it,” Vanity Fair critic Richard Lawson wrote in a review headlined, “’Justice League’ is a big, ugly mess.”
It'll make a heap of money though, because that's the trouble with superhero films, the fanboys are so desperate to see their homo erotic fantasies come to life that they'll see this things 2-3 times all while complaining how bad they are, which will mean all we'll keep getting is bad.
Save yourself some money, watch CAPTAIN AMERICA CIVIL WAR and just pretend Cap is Batman and Iron Man is Superman or vice versa and you have a better movie.