Of course Jerry Siegel, George Reeves and Christopher Reeve can't directly comment on the Zack Snyder/Henry Cavill Man of Steel, but we do know how they felt about Superman.
Christopher Reeve explained in his book Nothing is Impossible: Reflections (2002), "It seemed to me that the values embodied by Superman on the screen should be values that prevail in the real world." Christopher Reeve explained in Comics Scene magazine #1 (1987), "He's not a one-man vigilante force who goes around knocking people's heads together. He's more reserved. Superman's attitude is that people have to solve some of their own problems, they can't always look to superheroes. Superman's more like a student council president than Rambo."
And Superman creator Jerry Siegel explained on Superman: The Comic Strip Hero documentary (1981), "Superman stands for exactly the motto that they used on the television show - Truth, Justice and the American Way. A very clean cut guy who could have ruled the world and is powerful, but instead he uses his powers to aid the helpless and deserving, rather than to exploit them. The concept was that there would be a mild mannered reporter Clark Kent, Lois Lane who scorned him, but loved Superman, not knowing that Superman and Clark Kent were one and the same person."
And George Reeves explained in the Baytown Sun newspaper (July 13th, 1951), "Our idea is to give the children good entertainment without all the guts and blood and gore. We think the series should teach them something, too. That's why I decided to do this."