Rumors out right now is that the assembly cut of Justice League is currently at 3h:45m, plot is a mess, Batman got jokes, and The Flash ain't funny.
take all this as you will, including the Batfleck bailing on the suit, but just don't shoot the messenger.
there were also rumors that WW also wasn't all that good. It wasn't a final cut, but all filming is done... so I don't know... Not sure what to feel about DCCU going forward.
MoS was cool (certainly not w/o it's flaws tho), BvS was fucking garbage (and no I didn't watch the UC), and SS was more entertaining, but still a mess (Joker was terrible).
edit: for the record, I don't want DCCU to fail, I just want it to be good, like the cartoons were, like the Marvel movies are.