This is a movie you should see in a theater, but I would try to find it at a matinee. My reasoning is this, if we fall prey to paying to see movies with great special effects and no plot in the theater because we have too, producers will continue allow poor movie plots to come out.
If you haven't seen Disney's Pocahantes then you will find the plot new, but still shallow. There is so much more that could be done with this plot that it is sad they didn't do anything.