^Well, Singer said he is still proud of the film, and it got good reviews from a lot of the critics, plenty of people went to see it, so many thought it was a good film. He's basically just aknowledging that the fans of action wanted more action. I'm a fan of story and characterization first and I loved it. And I'm hardly alone (no matter what dogofkrypton say).
Despite the disappointing performance of Superman Returns, Singer still says he's "proud" of the film.
"There are a bunch of movies I've made where I'm, like, 'Yuck, that was weak' or 'That could've been better,' and I can see why. But with Superman Returns. ... If I could go back, I would have tightened the first act."