Reading some impressions you really get the sense that Snyder's biggest failing is that he doesn't have a feel for narrative flow and storytelling at a basic level. He'd probably benefit hugely from letting someone else put his films together after he shoots them.
It's the same problem with Man of Steel. More than an hour in, it's still doing the flashback thing, but the narrative shifts don't flow, the flashbacks don't really help to add anything to the present storyline most of the time. And if it's not helping, it's actually hurting - there's no real inbetween.
You can see he has high-minded intentions with the way he cuts his films, but he doesn't actually pull it off. It reminds me of when great comic book artists get big enough, they inevitably try to write too - and you can usually tell, suddenly these guys are "cutting" their own stuff, and it's not nearly as good.
I feel like this one was even worse than usual because it's the usual Snyder shittiness mixed in with obvious corporate mandates everywhere to build a franchise. It's like polishing shit with a turd.
I really have no reason at all to be optimistic about any of this DC universe stuff coming up. This movie was a total bomb imo, and they should just scrap the whole thing and start again.