Considering WB and by extension Whedon(since he was the hired gun)
-filmed nearly half the footage that we saw in the theatrical cut, cut more than 2hrs worth more footage, and repurposed and botched the stuff that was remaining
-Changed and oversaw the horrid score(music is like 30% of the whole movie experience)
-Was responsible for the amateurish color grading
-brought in his own editors
-was responsible for the obvious continuity lapses(visual or otherwise) WITHIN the film(lazily chose digital cameras rather than film like Snyder was using)
-used resources foolishly, choosing to reshoot stuff that didnt need reshooting(like Cyborg looking out of the window and saying "relax Alfred..."), which in turn stretched their budget, and meant things that did need money didnt get it cue...
-moustachegate
And it goes on and on and on. So yeah, considering that retooled the whole ****ing movie, and it barely resembled Zack's film in tone, style or content, yeah I'm gonna blame it on the people behind it. Whedon being one of the prime culprits.
If Zack had made all these decisions and choices, I would have blamed him too. But he didnt. He made two great CBMs in MOS, and BvS, and he has all my support and a lot of other people, and always will.