Let's face it: Larsson's trilogy makes for compulsive reading, but this is in spite of reading very much like a draft, ready to be edited by the author or (perhaps and?) his editor. For instance, since Salander and Blomkvist do not really exchange any communication, we get first Mikael's e-mails and then Lisbeth's reading them... it really proves repetitive and slow.
If Salander's character was what interested you most in The Girl with the Dragon Tattoo, you'll probably be delighted with this second instalment (and make no mistake, this is what this book is: a second instalment in a trilogy, not a self-contained story like the first).