The whole answer to why New 52 failed can be summed up in Jeff Lemire's Animal Man book with art by Travel Foreman.
The book was off too a fantastic start and than D C had to toss it and Swamp Thing into a long Rot crossover and
basically derailed everything Jeff had built to that point. But it did not begin or stop there as far as the New 52 goes,
it was everywhere and anywhere because a few people got to rule the roost and others re-wrote and re-drew and
re-wrote and re-drew or packed there bags.
I guess the move to California and more Sun helped things or at least the books have been far better (imho)