I haven't read the books, but liked both movies very much. On the whole I prefer the Fincher film (it gets the exposition done in a less tedious manner). But both have their strengths and are worth seeing in their own right. The Girl Who Played with Fire threw away the movie's best strength (the charisma between the 2 leads) for a fairly mundane murder mystery. It was so bad I didn't bother watching the third one. I'm hopeful that Fincher's take won't be bad, but don't have high expectations.