For a movie that attract so much negative press like Flash, is gonna to have terrible legs regardless of actual WOM. The bad press is too much for potential audience to bear or give it a try. In this digital era, buzz matters more than ever.
This is why I can't emphasis more that ATOW did something remarkable by overcoming the negative headline during its OW and come back alive, after the headline of the movie breaking $!bn start circulating and turn thing around.