Their issue has been indecisiveness and interference.
Some people clearly wanted a dark, serious tone to the movies and some people clearly wanted to be, quite frankly, more like the Marvel movies.
The compromise didn't work.
Purely from a tonal perspective this is a big improvement on the original cut. They've gotten rid of almost all the failed humour although they added other bits that didn't work. The more serious tone serves it much better. They've also somewhat learned that you can have a dark tone, serious movie without every single character being miserable and depressed like in MoS and BvS. Which is good.
Visually some parts look absolutely spectacular and other parts don't. Snyder has always had an ability to pick individually striking shots that are either directly lifted from or inspired by single comic book frames. The DC films excell at that. Zod on his knees in the ruins of Metropolis, The theme park in Harley Quinn, the bat signal standoff in BvS.
It's telling that with both BvS and Justice League that a later released re-edit has increased both critics and audiences scores. If that doesn't tell the executives to just butt out and leave the creative decisions to the creative teams then I don't know what will.