From a lot of what I read (Even Grant Morrison wrote in Supergods that not many writers seemed to be able to write a good Superman story.), the consensus seems to be that not many writers do really good with Superman, and it seems that a lot of people see him as too hard to relate to. Unlike Batman, who has had a list of classics or classic writers (And movies, games, animated series, etc.). And most of the Superman movies (Batman Versus Superman, Man Of Steel, Superman Returns.) seemed to be disappointing.
For the comics, is it due to editorial? Or his powers? Or the status quo? Maybe Batman doesn't have this problem because writers can do more with him. But Superman seems to have this image of being the Boyscout, and maybe people think that he's too powerful? I think that Man Of Steel and Batman V Superman tried to make him more realistic, but those movies were a little bit on the dull side. Maybe they'll give Bendis more creative freedom and he could bring something new to the books and provide a shot in the arm? I'll give it a shot.