A serious blunder was made by erasing the Justice Society from the New 52's history.

It's lazy to blame the reverse-flash  for all of Barry Allen's issues.

Teen Titans history was ruined by The New 52.

The Lobo in the New 52  was awful.

Superman Changes by John Byrne Cut Off Lots of Story Possibilities

Sue Dibny's Identity Crisis Reveal was horrific

Post-crisis, Hawkman's history devolved into a mess.

The Legion of Super-Heroes emerged from the Crisis on Infinite Earths worse than before.