Justice League is the movie that WB would surely like to forget. Even though WB tried to take a step in the right direction, the movie suffered a lot. By the time the movie reshoots took place, the big gun of the movie, Henry Cavill had been shooting Mission Impossible 6, and the contract of that movie did not allow him to shave the mustache that he had for the film.
So he actually shot the scenes of Superman with a mustache, and WB decided to remove that through CGI, and we all have seen how horrendous that actually looked. Check out the funniest Superman CGI Mustache memes that will make you laugh hard:
What Would You Do!
Turn It Off!
Who Would Win!
Here You Go!