The movie is ok but its less than what it should be.
WB has butchered it totally by deleting key scenes which would enhance the movie. There are many scenes filmed and deleted because WB mandated a under 2 hour cut, which is ridiculous.
This is what a Vfx artist says about it who worked on the movie.
https://www.reddit.com/r/movies/comments/7dhu3f/official_discussion_justice_league_spoilers/dq05bf7/
"No, vfx houses don't see or have anything to do with cutting the films together. We deliver shots, and find out if they're being included or not. A lot of lovely work was omitted, unfortunately, in favour of what we had to rush from the reshoots. Having seen the film now I'm massively disappointed that 95% of Superman's scenes are from the reshoots."
Even in the trailers, deleted scenes where Alfred supposedly meets Superman are missing from the final cut.
Looks like WB totally massacred this movie to try please people, instead of sticking to the vision of the director.
Apparently, Snyders original cut is 3 hours but WB didn't like it so got Whedon to rewrite some additional scenes.
Snyder's family tragedy meant he had to abandon it completely and so Whedon directed these scenes.
You only have to look at the reshot scenes, Afflecks wig is terrible compared to the original Snyder footage shot and many of the trailer scenes are missing in the final release.
The color grading is also way too bright IMO.
You can tell which scenes are Snyder and which are Whedon quite easily.
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Oh yeah, for anyone interested, here are leaked deleted scenes, including a Barry Allen and Iris scene which has unfinished CGI. God knows how they leaked this.
https://vimeo.com/album/4863137