Wow, wish I had seen this thread a month ago so I could have stood up for Pirates when massive essays were being written as to why it would fail against Superman.
As for the films themselves, I never doubted Pirates' success over Superman. I'm not going to lie, I don't like Superman, so I didn't go in expecting much.
I don't like Hulk and I hate Batman with a passion. But I still went to Hulk And Batman Begins, and damn if the movies weren't so amazing that I still loved them.
Superman, though. I fell asleep. Never happened before for me. Ever. I used to question how people could go pay money and enter a theater... and then fall asleep. It bored me beyond belief. Just terrible.
Pirates? What can I say. It rocked. It built on the first film, introduced new things, had the coolest action scene dare I say it since the original Matrix. I saw it at midnight Friday and twice on Saturday. Noticed more and more every time. It's funny, epic, mysterious, moving, exciting, unexpected, and completely true to the spirit of pirates in general.