Justice League was unfortunately caught in the middle when the backlash for Batman V Superman: Dawn of Justice, and its bleak tone, began. Development of the movie was well underway by the time BvS released, and the production team had to scramble when they realized the template for the whole cinematic universe was getting slammed left and right. It was always going to be extremely difficult for Justice League to change course like that, and the hard left turn resulted in a movie that was clearly directed by two different people. It may have been too late for Justice League, but it's not too late for DCEU films that weren't as deep into the process. Aquaman is coming next year and while it may not reach the success-levels of Wonder Woman, there's no reason to worry yet. If Patty Jenkins was able to deliver under these conditions, we can assume that James Wan can, as well.