I was not overly impressed with the first Hunger Games and this film was about as good. Pretty much just a remake of the original (complete with Liam Hemsworth appearing for five minutes, why he gets star billing is beyond me..Miley maybe?)
For reasons not very well explained all of the champions from every zone are forced back into the arena to fight in honour of the 75th centenary of the games.
The film ends setting itself up nicely for a sequel just as the original did, leaving a very open story-line. I have never liked this attitude to a film: they should be complete within themselves. It just looks cheap, this started some time back with The Matrix II and Hollywood films have been plagued with it ever since.