Postal & Far Cry are way better. DS movie has some cool fight scenes and Claire Forlani, but those are about the only redeeming qualities.
Still, the movie's complete lack of focus & plot is remarkable close to the actual DS game. The DS game seemed to make up the plot at the spot as one trounched baddies... "oh yeah, you just killed a dragon, now go further east for more answers"... "so after killing the evil Seck Necromancer, the heroes decided to go to the Temple of Doom to investigate", etc.