Apparently, the DC Extended Universe is so bereft of hope, so utterly beyond saving that Informant would allow "timing" to prevent him from seeing the JUSTICE LEAGUE film. It's time to face facts. The DCEU is done when a man who has filled page after page with ranting about BATMAN VS. SUPERMAN's successes and financial excellence can't find the time to see JUSTICE LEAGUE and while I applaud Informant putting a brave face on the situation, it's clear that the film franchise died the day Informant watched JUSTICE LEAGUE pass out of theatres with an indifferent wave having never seen a single frame of the movie within one of its cineplex screenings. I take no pleasure in observing this death knell, but we can't live pretending the world is something that it isn't.
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Steppenwolf is a terrible villain. I don't see that being a problem, however, because as edited and structured, JUSTICE LEAGUE doesn't need him to be a great villain or to have meaningful motivations or philosophies. He just needs to be there so Superman can punch him. He is precisely what the movie needs, but absolutely no more and while it's a flaw, I don't feel it's a problem. It's like Snoke in THE LAST JEDI; the movie's not about the villain, you don't need to know all that much, it doesn't matter.
As for the retconning to claim Superman was more liked than he was -- I see some of it and I also don't. Superman failed to save the Senate and failed to save the village, so the idea that he was holding back the legions of Darkseid seems unlikely to me. However, BVS does enough to show that the average person feels Superman is "all some people have," as Lois said, so I can buy a mourning and a sense of loss and revering children with cell phone footage making Superman seem more meaningful without the darker elements BVS emphasized.
Ben Affleck is significantly heavier in JUSTICE LEAGUE than he was in BATMAN VS SUPERMAN, but it isn't fat. It's muscle. He's gotten even bigger since his debut.
There are a lot of oddities in the film that would have been there regardless of the directorial situation. It's not explained where the Flash got his suit; I assume he used his powers to mine and/or steal anything he needed to build it.
The secret identities were treated with total disregard in this film and I'm not sure what to say about it. I got the sense that Zach Snyder was deeply disinterested in the secret identity aspect of Superman given how Lois is in on the secret pretty quickly in MAN OF STEEL. Personally, seeing Bruce approaching Arthur in the village and Lois yell for Clark in Metropolis added a lot of tension for me: the situation is so desperate that secret identities are no longer worth the time.
I thought the chemistry between all six characters was fantastic, especially the way Henry Cavill haunted the whole film despite his absence. Bruce saying that Superman was the most human of them all because he lived like an ordinary guy was beautiful. Barry's awkward crush on Diana was very sweet, particularly his awestruck first meeting ("Hi, Barry, I'm Diana." "Hi, Barry, I'm Diana, no, that's wrong."). Barry falling face-first into Diana's breasts is a very Joss Whedon sort of moment.
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My feeling as to why the movie is turning out to be such a bomb critically and financially: first, the release date should have been pushed back once Snyder left the film if only to finish some of the special effects rather than see them released as they were. Second, and this ties into the first point, the effects on Superman's face simply weren't finished. If WB had successfully kept a lid on Cavill's mustache, I don't think the audience would've been looking for it, but because it was in the press, the audience was looking for it and it couldn't withstand scrutiny. Third, from a PR standpoint, Whedon shouldn't have directed the reshoots as a director; he should've just been a producer -- because the whole world knows Zack Snyder and Joss Whedon have fundamentally adversarial styles and is looking for mismatches whether they're there or not. I would have hired Greg Beeman or Adam Kane (HEROES and directors who use lots of speedramping) to execute Whedon's marching orders.
But because WB did what they did, the result is that people are looking for all the seams and joins and staples rather than sitting back and appreciating the movie, and if you look for flaws, you'll find them because all movies have them.