The "Superman" theme was not a literal translation from the Reeve films, it was more subtle and nuanced. You could hear it for about 7 seconds when Superman first showed up to fight Steppenwolf.
As for the film, it wasn't great but wasn't bad. Ultimately they stunted the character development to save time. I think they panicked a bit after the poor fan/critic reception of BvS and not only changed horses midstream, they changed streams. This was a two-movie concept that they whittled down to one film. We lost Cyborg and Flash backstory in the transition. Cyborg really suffered from lack of development.
Kevin Smith and Marc Bernardin do a pretty solid/humorous review of the film and I mostly agreed with the pros and cons(NSFW):
(Actual review starts around 13min mark)
As for the film, it wasn't great but wasn't bad. Ultimately they stunted the character development to save time. I think they panicked a bit after the poor fan/critic reception of BvS and not only changed horses midstream, they changed streams. This was a two-movie concept that they whittled down to one film. We lost Cyborg and Flash backstory in the transition. Cyborg really suffered from lack of development.
Kevin Smith and Marc Bernardin do a pretty solid/humorous review of the film and I mostly agreed with the pros and cons(NSFW):
(Actual review starts around 13min mark)