I thought Dragon Tattoo was good, but I felt like the film was extremely disjointed in it's construction. Without getting too spoiler-y, I enjoyed the main narrative with Daniel Craig and his investigation, but intercutting that with break scenes of Lisbeth and what she goes through independent of all that felt very disjointed.
I felt like I was watching a murder mystery that had been spliced with a snuff film.
Admittedly, I have zero familiarity with the books in this series. And, frankly, after watching the movie, I really don't have a great desire to go and read them if the contents are as brutal as what was depicted on screen.