I'm warming up a bit on Lisbeth Salander. She's legitimately troubled. She had a state-appointed guardian she cared about who just had a stroke. Her mother is in an institution. And yes, she's whip-smart and attractive, but I'm willing to consider her three-dimensional, especially since the rest of the book is so good.
There's a sequel (yay!) but not much after that, as Stieg Larsson died a couple years ago (no!).