I have almost zero interest in watching this knowing that Gunn is basically resetting the whole DC Universe after this movie has aired.
What's the point in character growth and development knowing that it's all being reset for the future movies? I enjoyed all of the Justice League universe movies, but what's the point in this one? Likely leaving loose threads that we'll never see finished. If they have cut Amber Heard from the movie after it finished shooting, it'll be some kind of abomination like the original Justice League movie before the Directors Cut (I don't support Amber Heard or think she should be in the movie, but if they've cut her in post-processing it'll likely be awful).
It's the same reasons I haven't bothered watching The Flash yet, a movie I was super hyped about before the reboot news.