Read the books and went and saw the movie last night.
There are a lot of differences between the book and the movie, but there isn't anything that just drags the movie down or makes it as awful as a lot of people say. The muttations weren't what I thought and the Cornucopia was said to be golden in the book but was a gun metal color in the movie and most importantly, the ending of the movie wasn't on par with the book. They left a lot of things out, but I really enjoyed seeing it. The Avoxes weren't given the part in the movie that they did in the book and I missed that, especially with the red headed Avox knowing Katniss and Peeta. That played a part in the book with Katniss's emotions after she first meets the Avox girl, but it wasn't even mentioned in the movie. The Avoxes were in the background, but that's it. Maybe they'll make a showing in the deleted scenes of the DVD.
Effie's outfits made me laugh every time she came on screen.
I'm not a Woody Harrelson fan, but he did a good job as Haymitch. I absolutely loved Lenny Kravitz as Cinna, Katniss's stylist.
The Rue scenes were excellently done and were the best in the movie IMO. That's all I'll say so I won't spoil it.