Fans of the books that I know had reactions from a shrug of just being happy to see some of the scenes from the book come to life, to raving mad that they left out key scenes that may seem unimportant at first glance, but are important for character development. People that haven't read the books first, seem to love it. But book fans seem to be okay with it at best, at least from what I've encountered.
My personal take on it? It had a totally different tone from the book. It still comes across as a strong heroine overcoming horrid obstacles, but the story seems simple and rushed. I thought it was a good movie but it could have been better. But if you've read the book and go see the movie, the one thing you need to chant repeatedly to yourself is that it is not the book on film. It's Gary's vision (Addams Family Ref) of the book on film.
and my pet peeve about the movie for those that have seen it:
They made Peeta very weak and vulnerable. In the book, he stands up for himself often whether arguing or fighting, but in the movie he constantly needs Katniss to protect him, lead him. The destruction of a fully fleshed out character isn't what drives me completely nuts, but the idea that they had to do it because a strong female lead would wither next to a strong male.