The plot is routine and entirely predictable in the Hollywood blockbuster mold (and nobody will be winning any Oscars for their acting performance, especially not its two big American leads) but this movie is all about its stunning visuals.
As much a lightweight fantasy/sci-fi as a medieval style action romp, it obviously wont appeal to all fans of those genres, but it does make excellent use of its 3D platform and landscapes, and on a big screen TV is an hour and a half of pure popcorn entertainment.