New 52 was only "bad" because they didn't do any top level planning even though they were supposedly rebooting the entire universe and they were going to line everything up. But they didn't. So you wound up with Batman and Green Lantern continuing on as if nothing had happened. And you had Morrison writing a book taking place five years in the past for Supes at the same time other writers were supposed to be writing a current book but weren't allowed to know anything Morrison was doing, even though Morrison was writing a self-contained loop of a story like he's fond of that had no real ramifications outside the first few issues.
And the Batman problem was just ignored by everyone but technically the New 52 logic meant that his entire career had happened in five years, Dick, Jason, Tim, Damian, No Mans Land, Bane crippling him, "dying" and falling through time, etc. all in just five years!
They could have easily written a fix by saying there were no powered heroes prior to Superman, so Batman, Green Arrow, maybe even someone like Black Canary slightly modified, etc. would all be okay. Earth 2 basically did an inverse of this, putting a five year gap of no powered heroes instead.
This is basically what DCFU is doing, in
Suicide Squad, Waller says something like she doesn't know if Superman caused them all, both good and bad, to come out public finally but non powered people like Batman, Joker, etc. all were around and had adventures before
Man of Steel. And she had started collecting the Squad not long before which for the most part aren't superpowered in the Justice League way.
And a lot of the mid-stream reboots or cancellations were terrible. Stormwatch, Batgirl, Batwoman, etc. Snyder on Batman and Johns on Justice League were the only guys who really told a story from start to finish. As soon as Johns left Aquaman and Azzarello left Wonder Woman they fell apart. Same with Simone on Batgirl and Snyder on Swamp Thing. Catwoman was a mess and the writers couldn't decide if she was supposed to be in the Bat family of books or not after Winick left, and everything in the "Dark" line went through so many writers I wonder if anyone is even credited for multiple collected TPBs outside of Animal Man and/or Lemire. They weren't even finishing stories in Justice League Dark/Constantine/Constantine The Hellblazer and the fact that the character had three seperate books is pretty good evidence of not knowing wtf they were doing. I like pretending that all those people are still trapped in the House of Mystery (or Secrets?) because Constantine never went back to it and Zatanna randomly showed up later so neither of the owners could have let them out.
Really it was just a lot of starting stuff and it ending randomly and them cancelling stuff instead of concluding anything. The Superboy/Titans books spent a lot of time on setting up the Ravagers spin-off and then I dunno maybe they died or something? Literally everything involving the Daximites plot and Helspont randomly disappeared. There were those people watching Superman and Shay Veritas had some kind of secret, bupkis. And there were like two Superboys at one point. (FORESHADOWING?!?) Supes having his identity exposed and losing his powers went nowhere as a story because they had to fix everything back up for his death.
Infinity Corporation seems to be part of something larger since it's continued through Rebirth.
Trinity War was a bad crossover with terrible tie-ins, Forever Evil was ultimately pretty lame and Convergence was hilariously bad and made almost no sense. Most of the Supes family crossovers were pretty bad, He'l, Doomed, etc. The weekly series were all better than any of the crossovers probably. It would have sucked to see The Multiversity wasted but thankfully Snyder has brought it forward.
Really you're just left with Snyder's meandering Batman arc and then Johns' Justice League (and related including Forever Evil) as the pillar which culminated in a "crisis" with Darkseid War. And it's more of a disappointment than it is anything bad as there's lots of individual good stuff in those other series, Rotworld was arguably one of the better family crossovers, Grayson was fun, etc. But when they were setting everything to the same point and launching from there you needed some greater oversight to put all the pieces together in a satisfying way or else the whole point of the New 52 wasn't needed, which they ultimately decided on and so we had Rebirth to undo Flashpoint a bit and let time flow back more naturally aside from Dr. Manhattan's whole thing. And really they were never committed to New 52 anyway other than to reboot into younger versions of Supes, Wonder Woman, etc. for whatever reason even though they wouldn't touch Batman, etc.
And now the whole thing has led to yet another origin story for Diana because sure why the fuck not, let's do another one for Donna while we're at it.
