As the first Justice League movie is not bad.

Rating: 8/10 (18 November 2017)

I think it's a good movie that lays the foundation for what's coming up in the DC Universe.
It is true that it lacks details that have to be polished but have well-established characters such as Wonder Woman, Flash and Batman. The evolution of Cyborg and Aquaman remains to be seen.
I like the overall aesthetics of the film, hopefully the changes they introduce for the future are to get the film to reach 100%.