Don't go in with high expectations. Because if you do you will probably be disappointed. Like others above have stated this is strictly an action flick. The plot and the new characters created for Advent Children are pretty poorly done. The scenes are choppy and are hard to follow throughout much of the movie and the newly created characters have very little depth.

So don't go in expecting much more than just an incredibly animated action movie. This movie does not expand upon the game by any means. It will only serve you well for nostalgic purposes in seeing characters again for the first time in close to ten years.