I have low expectations for this movie. I think Wonder Woman is gonna be DC's best movie for a while, Justice league itself might not flop financially because fandom, but it might flop in being a good movie.
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$863 million is not almost a billion dollars, it's still quite far off. Even with after DVD/BR sales included it can't break $1 billion.
It's not bad when we look at it, but movies around $250 million budget, they want them to gross over $1 billion in theaters alone.