I was actually surprised to learn that CA:CW was made BECAUSE of BvS's announcement at SDCC. The Russos doing the CW storyline was in reaction to BvS. Otherwise they would have done something else, that would probably have more Steve/Bucky/Sam and less Tony.

But instead, it's BvS that seems more slapdash even though they had technically more time to develop it. There ARE parts of CW that seem shoehorned in (cough Spidey), but the joyous character interactions more than make up for it.
So, in the light of this revelation about CW and the ongoing development of IW-no-longer-in-two-parts, Marvel and Feige are obviously open to being somewhat flexible about their game plan. But they don't lose sight of the overall vision, or their first goal of making entertaining movies.
I think the bulk of MoS/BvS's flaws stem from trying to do too much at once, in their quest to differentiate themselves from Marvel. All the serious themes in the world won't make up for inconsistent characterization of dispassionate or fearful characters, or for boring story. You don't get points for trying to make something high art, if it ends up having poor basic technique (ie bad storytelling/characterization). You have to have good technique first, then add onto it. That's what Nolan did so well with his TDKT.
Seriously. Anyone who thinks Superman can't be true to his square-ish boyscout self need to see how Marvel handled Steve Rogers. It CAN be done.
Snyder & Co did try. They put Superman in a world that didn't trust him, complete with military engagement. I think that IS a good place to start, with the "man out of time" thing that is forever Cap's conflict. The problem, IMO, is that Superman isn't engaging. He seems dispassionate about what he's doing. It comes off as if he's choosing to do good only because he has all these powers and he might as well do SOMETHING with them, and he's not a jerk. Batman is by far the most engaging character in BvS, because he shows passion. He's not just angsting about Superman, he's doing something about it without anyone telling him to. And even then he's acting out of fear, which isn't engaging after a while.
Every single one of Marvel's character shows passion in what they do. (Steve Roger has been, "YOU'RE BEING A BULLY FIGHT ME" since the day he was born.

) They act, sometimes impulsively, but at least they're trying to get ahead instead of just catching up with what's going on. Every single one of them at least looks like they enjoy what they do.