My bad. I forgot the film only made 5 million world wide.
Personally, the people who show the most 'concern' for the next film are the people I would be least concerned about pleasing. All sarcasm aside, the GA seemed well pleased with MOS, and more importantly, the big wigs at WB were also pleased. We know what they do when they don't care for films (hi, poor GL and SR).
They know they have the right Superman, they feel confident enough about Goyer and Snyder to give them another film. If the movie was as atrocious as certain people on here try to proclaim, there is no way WB would give Snyder and Goyer another go.
Was MOS the greatest, deepest film to grace a movie screen? No. But it wasn't meant to be. It was designed to be a mythic superhero film about a hero who is struggling with his identity. That is what we got.