I am a huge DC fan. I did not like this movie.
Pros:
King Shark
Boomerang and Constantine
Etrigan
Cameos
Cons:
Tone
Pacing
Inconsistent Characters (Barry the villain, Superman on the warpath)
Wasted Potentialn in Cameos
No Central Characters
Story was kind of all over the place
If you would like a good movie with a great story about vulnerability and effort, I recommend "Death of Superman" small things like him hugging the kid, feeling unable to express to Lois who identity, his never give up attitude, the underdog feel makes you root for Superman, and I am not a fan of the Superman archetype.
I also recommend Flashpoint Paradox, it tells the story of accepting the things you cannot change a lot better.
The ending was a let down, it basically said nothing matter, I wasnt expecting anything like the New Frontier, but a hard "reset". Why could we not just say goodbye to the characters. This felt like a bif middle finger who became invested in any of the movies.