Things that led to the failure of DCEU (So Far...)

Just wandering how DCEU would be if they had not tried to copy Marvel's formula of shared universe. May be worse or may be much better?
(1) The first thing they should have learned that the Man of Steel tone didn't work with the audience as he is a symbol of optimism not someone brooding all over the place and the weird choices of scenes.

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(2) If they were in a hurry to catch up with Marvel may be they should have called the FLASH to cover the distance by making a lighter tone fun movie instead of introducing Batman V Superman who were both depressed in their own ways to topple each other before realizing both their mom's name was Martha which was by far the best creative joke in a serious action scene which could have been avoided.

By the way who lets loose the two most iconic characters to pit against each other without having a history of at least two movies each without having some sort of cameo in each other's movie to build the excitement like the way marvel did. Isn't that what shared universe should feel like? That's a huge missed opportunity and made people somewhat reluctant to face the next DC movie whose ramifications was felt in "The Justice league movie".

(3) Huh! Justice league movie which should have been Mat Damon's dialogue from the movie Martian "On your face Avengers" turned out to be some justice league movie with Jack Snyder leaving justice league midway, Josh Whedon stepping in to re shoot God knows how much portion of the movie , Superman invisible Mustache , bad CGI villain. So much happened behind the camera that it could itself have became a damn good movie or even would have out grossed Justice League.

Lets hope DC turns the table around in its future movies.