New 52 was started by Didio as an attempt to bring in more readers. Unfortunately as he had stated in interviews at the time, the readers he was looking for were the people who read comics in the 90s. It seemingly never occurred to anyone that those people grew up and changed but the content they produced by and large was almost a replucant of slick, violent 90s content.
As has been said before, after they got the ball rolling there was no clue where it was going as directions changed all the time.
Then fans started asking for their favorites...where's the original Teen Titans, the original Wally West, the JSA...and all we got was mockery from the one driving the ship. Thats not a great way to win friends and influence people.
Then came along Convergence which hinted that those characters were there and gave readers hope they might be integrated into the new DC.
But they didn't.
Then came Rebirth as Geoff John's was promoted to similar status as Didio. People can say what they want, but Geoff knows what sells and how to sell it. Bringing back Wally West and hinting (again) that the JSA were around the corner and going into Doomsday clock it looked like all our favorites were about to be put on the board Then things changed all again and Didio was back in charge of the ship and things were quickly put back thevway he wanted.
Through it all, the common denominator was Dan Didio. Sure editorial re-wrote scripts, moved artists like spastic checkers but all that had to be done with allowance. Very little that happened in the last ten years happened because fans asked for it. The majority happened because Didio wanted it that way.
Thats not to say good didn't happen..there was. The majority of it though was a sabatoge of an enormous ego.