Man this makes no sense to me, they literally have to do a mini back ground on 3 of the characters. At least half the movie is going to be searching and convincing them to join. Unless this is a 3 hour movie I don't see it working.
They should at least let Aquaman drop, flash and Cyborg are kids and easy to convince to join a team.
Also that Mera looked spot on, The chick playing wonder woman is the perfect WW imo. I like that she's not swole, I've always been more of a fan of the feminine wonder woman outside of the muscular one drawn ones in the comics
I'm sure Aquaman and flash and cyborg will already know what Batman is about and it won't take that much convincing, 30 -40 min tops