Also higher-ups that seem to have no grasp of the properties they are handling.
From what brilliant mind came the idea of melding together the storylines of The Dark Knight Returns and Death of Superman?
And to make it worst they do it as the second movie of the new Superman movie storyline and the first of the new Batman movie storyline... maybe if it was the 10th movie of this new shared universe and even so.
"Lets throw in the two most beloved and recognized icons of comic books and pop culture, we can't go wrong there, people love them and they are so much bigger than anything Marvel has in their cinematic universe. I know, lets also throw in two of their most impactful or known stories, we already know these stories were big with the crowds, that way we guarantee we have a sure thing here and it will dwarf what they have"...
Trying to race against a massively successful franchise that has some 10 years head start made these executives make the worst decisions possible at every turn instead of allowing passionate creators do what they do and truly explore the potential of these massive properties.
(At least someone had their head on their shoulders when they made Wonder Woman)
edit: I may sound quite critical but I also don't hate the new movies, they just don't live up to the immense potential they have as you said. Here's hoping we get more Wonder Woman-like quality and heart and less of the rest