All in all, not bad. Better than BvS, but not as good as Wonder Woman. Would have liked to have seen Darkseid appear. Hopefully in the sequel. Would have been better to have at least Martian Manhunter and a GL too, but still ok. Looks like they changed the origin of Barry/Flash for this movie, but the end result is still fine, hope explained later. Glad Superman was brought back; figured he would be. Nice to see Deathstroke at the end with Lex. Movie kind of dragged in scenes without Wonder Woman, also.
One complaint: Batman using guns on his vehicles. Foul!
Overall rating: 7 out of 10.
The armed Batmobile convention has become such a standard I stopped getting annoyed by it a couple movies ago. Even in the comics there's usually rubber bullets or some such thing going on.
I did freak out for a while when Batman picked up the space rifle and started blazing away, but the Superman return right after that was uplifting enough to calm me down.