For a character as physically powerful as Superman, it's a lot more interesting to give him dilemmas about what he will do rather than what he can do. It would be nice, though, to have these dilemmas be uniquely suited to Superman. I'm sure Rama Set will disagree, but the angst in MoS bugged me because of how generic it felt - the furrowed brow, the sullen brooding, the frowny face, etc. I don't know, maybe some more dialogue might have helped it feel more purposeful, but internal struggles about hesitance to accept one's destiny or searching for a purpose in life have been done before, many times, and there are so many more interesting challenges that Superman could be facing instead. It does look like BvS is going to be addressing some of those bigger issues, though, so hopefully that'll work out.
But making Wonder Woman dark and edgy as well is ridiculous. Once is happenstance, twice is coincidence, but three times...DC/WB really are just going to go dark with every single one of their superheroes and have them all be brooding and cynical.