Ok, we can't re-shoot Batman v Superman but maybe we can improve it with editing. Post [b][i][u]one[/u][/i][/b] editing idea that would improve the movie. Keep spoilers hidden with [spoiler]spoilers.[/spoiler]
Here's mine: speed up [i]all[/i] slow motion scenes.
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Get rid of Superman or get rid of their fighting. Either alter Wonder Woman's character to make her more complex and interesting or reduce her part. Get rid of crappy boring Doomsday. Introduce a good Batman villain to work with Lex Luthor maybe. Have more Batman. He carried the movie. Ensure a consistent, flowing plot and subplots by having clearly established conflict or threat relatively early. Don't make it shite.