This is pretty much where I stand, though I knew it was a deconstruction and that was a major reason I feel it didn't work. So many of these characters were in need of a proper "construction" before we should talk about a "deconstruction", but Snyder skipped right to the deconstruction. It blows my mind the first film-appearance of iconic characters like Wonder Woman and The Flash are in a film that's about breaking their mythos down.
I think a deconstruction would have worked so much better if, well, they had been built up first. I know it's not fair to always compare the DCEU to the MCU, but I think about Captain America as the MCU's Superman - idealistic, old-fashioned, "outdated", etc. He's introduced as the selfless hero who was heroic long before his powers, that other characters admired because of his values and steadfast morals. And soon after, in the modern world, the MCU begins questioning his place in a less black-and-white world, and Steve has to grapple with a world that doesn't respect or value the optimism he believed in and espoused. He faces a world that is open to turning on him and declaring him a public enemy for daring to question the military and government. Bit by bit, he finds himself having to compromise his values for the "greater" good (lying to Tony about Bucky's hand in his parents' deaths, going from "we don't trade lives" to "whatever it takes", etc.). By the end, Steve has been broken down as person and a symbol, and his legacy carried on into Falcon & The Winter Soldier where the differing views of what Steve represented - to the government, to the world, to his teammates, to minorities, to his friends - is explored in great detail. Marvel continues to do this with other characters (particularly in their "What If" shorts).
I would love a Superman that's deconstructed like that over time. One that is established FIRST and then over time painted with shades of gray as his worldview is challenged (specifically by Batman). We skipped over all that nuance, and that's partly because Snyder wasn't interested and partially because WB wanted to rush that framework into their own universe of hero films. I know exactly what Snyder intended, and I respect that he went the direction he did, but it was a colossal misfire of timing and universe-building. I still WANT a great deconstruction with great execution, but I don't feel this was it.