I cared about Supes, I may be in the minority but MOS was the film that made me love Superman, whom I never cared about before. So despite being a Batman fan since childhood I actually found myself rooting for Supes throughout the movie.
My problem with BVS was not so much the characters, it was just the whole film felt like it was trying too hard to be everything at once, trying too hard to make some philosophical statement about what it means to be a hero... that it lost its direction. Too many ingredients spoiled the soup, so to speak, I felt their was a good film buried somewhere underneath their.
But anyway I'm hopeful now for the future of the DCEU, so long as they take a page from the success of Wonder Woman and keep things simple. Let Superman be Superman, let Batman be Batman, and let the film be a Superhero film, etc. And we all know you can tell a Superhero film without becoming Marvel, Wonder Woman was the perfect balance of darkness and light, keep that tone and I see nothing but great films in the future for the DCEU.