They do focus tests sometimes when a movie gets released. It's generally looking for a different type of info than test screening forms, I've filled out both types. Focus tests after release are looking for info on why you chose to watch the movie (one of the stars, the story, what the story was based on, ads, yadda yadda) and if the movie fulfilled the expectations you had coming into it. Had you filled it out you would have gotten to complain about the ads. I didn't see it billed as action because I've read the graphic novel so I knew going in it should be (depending on how well they stuck to the story) a fairly down think piece that happens to have a couple of good booms in it, didn't pay much attention to the ads because of that other than a reminder of release day.
I liked the movie. The ending really didn't say what you said it did. There's no indication that all of a sudden everything is better, just that the totalitarian government has been over thrown, maybe that makes things better, maybe not. They did drop one of the messages of the book that often after getting rid of fascism the next phase is anarchy which in many ways is no better, but they really didn't say it was all better just that the evil government is gone.
It won the weekend by a healthy margine, whether or not it'll turn a profit is still in question, but it's looking fairly good.