2 & 3 are very different from Dragon Tattoo. 2 & 3 are essentially 2 parts of one story. I enjoyed all 3, but Dragon Tattoo is the best of the 3. I wish the author had lived to finish more. I'm hoping Sony finishes the film trilogy.
Just finished it the other day and yeah the 2nd and 3rd are awesome. The 2nd is basically just a set up with the 3rd just blowing up. I know it's weird to say but I would love to find me a chick like Salander. Smart and tough as nails. :fap: