I finally broke down and went to see the movie with my son. I would say that, if you have never read the book you will probably be fine; if you have read the book, get ready for some inconsistencies. Actually the movie lacks depth.
The relationship between Katniss and Peeta is almost non-existent. The book has more romance between these two and you certainly root for them and their relationship. The movie failed to deliver on the romance and ended up making Katniss look shallow and un-engaged.
Peeta never loses his leg, Rue was released from the net in the movie, Peeta did not pass-out with the "soup", Madge Undersee does not give Katniss the pin rather Prim does. These are but a few.
With that being said, in the book she does a lot of internal thinking. This is difficult to depict in a motion picture as those scenes are either cheesie or can only be used occasionally lest you want something like "Castaway".
The Main Cast:
Jennifer Lawrence - Katniss Everdeen
Josh Hutcherson - Peeta Mellark
Woody Harilson - Haymitch Abernathy
Full Cast Click Here
With regards to Josh Hutcherson, I think they made a bad choice. Katniss was way too much women for him. He is supposed to be strong yet looks below average.
The movie get pretty graphic when they start killing the tributes. May be too graphic for 12 and under.... although they probably are not reading the books.