I'd really like to know... Man of Steel was just an out and out bad film that not only had objective pacing issues and hamfisted writing, but betrayed the character so badly that I can't even say it was Superman.
That's a misuse of the word "objective."
It really was a great movie as far as I'm concerned, and certainly more tightly written than STID. Cavill's Clark/Superman is now my favorite, with a possible sentimental exception for George Reeves.
Look, it's just a fact that a lot more people around the world are familiar with and intrigued by Superman than by Star Trek.