Agree completely. And I think the biggest thing is neither Snyder nor Goyer like that morality is one of Superman's key components. I think they feel morality is a lot of what makes Superman "old-fashioned and corny". Certainly none of the characters in MOS had any sort of morality or compassion apart from maybe Ma Kent. I really think Frank Miller's influence on Snyder is much deeper than anyone understands, and I think Batman V Superman will prove that. And to me, the biggest reason why Miller dislikes Superman is he just cannot buy into the idea that someone that powerful could be that moral and compassionate. As a follower of Ayn Rand, I imagine Miller feels Superman is betraying his power and his potential by wasting his time with lesser beings. I think the way they all see these characters is summed up in Miller's admittedly brilliant Daredevil #191:
Daredevil: "What am I giving people by running around in tights and punching crooks? What am I showing them? Am I showing them that good wins out, the crime does not pay, that the cavalry is always on its way — or am I showing them that any idiot with fists for brains can get his way if he’s fast enough and mean enough? Am I fighting violence — or teaching it?"
This is who "wins" in MOS-the idiot who is mean enough. And MOS Superman certainly is fists for brains.
All of this is very sadly true. The entire movie is making the point that Superman as a character and as a concept is not viable and not possible. There are three pillars that Superman is built upon as a character: power, wish fulfillment, and morality. MOS threw away the last two, and the first one only works with the other two in play.