I'm about 3/4 of the way through Mockingjay by Suzanne Collins, Book #3 in her Hunger Games series. Mike has been reading pans of this book amongst his children's writing community.
I don't know if I'm just less critical (although I expect not), but I'm having a hard time putting the book down. (I can't exactly say I'm ENJOYING the book...because similar to Stieg Larsson's series, it's not enjoyable subject content.)
I think that when authors have a huge hit, it's difficult for them to meet their readers' expectations in upcoming books. The only major series that comes to my mind in which readers were not disappointed with subsequent books is the Harry Potter series--most people would agree the books got better as JK Rowling wrote more of them.
For those of you who have read the Girl With the Dragon Tattoo series, you must read this wonderful parody by Nora Ephron. I've posted before that I think this series should be called Coffee and a Sandwich. Or as Ephron reminds us, "Kalle fucking Blomkvist."