My own personal opinion, any Superman ( or Spider-Man) film that you can't take a child to is a failure. Batman, I get that. BvS not being kid friendly doesn't bug me much, but Superman? Not so much. I expect Superman to be inspiring, and good to his core. That's what makes him Superman. I'm not a huge fan of the character nowadays because they always try to paint him with this conflicted nature or potential for moral ambiguity...and that's not Superman I'm not just talking about the movies, but in comics, that has been the case for years. Man of Steel's defining moment was him saving the busload of children. THAT was Superman. The scene where he let his dad die? FAIL. Him being unable to save his dad in the original from a heart attack is one thing. Him watching Pa Kent die because his dad waved him off, nope. Also, him destroying the tractor trailer because a guy was a jerk, nope. There was just so much wrong. You can allow him to have an awesome action sequence and even fight dark villains, but when he begins snapping necks and what-not, you lose.
For those who like to point out that he killed in Superman 2, the Richard Donner cut had him turn back time and re-imprison all three in the Phantom Zone, undoing their deaths and the destruction that followed. A cop-out, but it was a way to prevent death, which is kind of Superman's thing.
Just my two cents. Also, keep in mind I didn't HATE BvS, but the fact that it and JL effectively killed the Batman and Superman franchises for the time being says all we need to know about how the general public regarded them. For what it's worth, I really LIKED Justice League, and had it came out in a pre-Avengers world, it would have been something amazing! It's still not bad. It's just...not amazing.
Sorry for the rant.