I just saw Man of Steel, I'd hesitate to call it better written than STID.
I wouldn't, not for a moment - on at least two simple grounds: the internal logic of the plot is tighter, and the story requires less interest in or familiarity with back story from previous films or stories.
It's, I suppose, more accessible, if you like to see origin sequences that take 2.5 hours.
To most people, it's just a
story. You shouldn't have to invest in the notion that there are other stories which precede and follow the one you're watching to get everything you can out of a movie.
Besides, Superman has the best origin story ever; in many ways his origin is his whole
story. All the stuff that comes later is kind of tougher to get involved in.