This movie is not playing in too many theaters. It is in Swedish with English subtitles, so I imagine it’s not going to break any U.S. box office records!
It is a very interesting adaptation of the book of the same name. The Girl With the Dragon Tattoo was quite a lengthy book. The movie has been simplified, and some of the details have glossed over and the order of events changed, but it is definitely faithful to the spirit of the book. This movie is in no way a Hollywood production. The actors are ordinary looking people. The scenes of sex and violence, while not numerous, are raw in a way rarely seen in Hollywood (the film is not rated).
Reading the book first would be helpful, since I think otherwise the movie might be confusing. Or, you can wait until the Hollywood version is released, scheduled for 2012. But if this is playing in a theater near you, I recommend seeing it.