The movie was not as bad as the critics are making it look. Out of all, what I liked the least was possibly The Flash and the actual graphics, which you could see that the movie had been filmed with a green screen.
I felt like Ezra Miller portrayed a very childish Barry Allen, which I hated and thought he had too many forced and inconvenient jokes and, also, unnecessary moments.
I've noticed that people have been saying that Wonder Woman/Diana was overly sexualised in the movie, which I do agree. I felt like some of the progress that was made in the Wonder Woman movie had been lost and, honestly, I don't understand how Gal Gadot accepted to wear some of those clothes. However, I also felt like they also overly sexualised the male superheroes in some scenes.
Overall, I feel like if they find a way to improve some of the bad bits, they do have an amazing potential for the sequels. If you were paying close attention to the movie, you noticed how they hinted small things, like Barry saying how he knew Gorilla Sign Language (Grodd) or when Alfred was talking with Bruce and he mentioned Penguins, which gave me a hint that maybe we will be meeting Penguin soon and after, the 2nd post-credit scene, I started to think that maybe those will be two of the villains that will be in the league that Lex is creating.