Another thing I think Snyder underestimated is how important origins can be. Stories and appearances come and go, but be careful if you mess with an origin, that will be remembered more. (That's probably why comics go the origin well a lot, because they sell because fans care)
I can't tell you all of Freeze's New 52 appearances, but I can remember that Snyder Annual and how much I hated that origin.
Snyder stupidly went against like one thing that (feels like) all comic fans agree was the best development in the history of Mr Freeze....Heart of Ice.
You have to wonder what Snyder was thinking (hellbent on doing something different? arrogant confidence in his version?). How did he think this new origin would go over? It was not even close to the better story of Freeze's origins.
I frankly hate writers so hellbent on doing something different to the point of tearing up a fan beloved origin/story. Fans play a part in canon now too, more than ever nowadays.