As someone that actually watched a lot of the movie promotion on TV, I'd say that the extreme focus on the legendaries and particularly on how awesome it was that you could get them for your video game actually overshadowed the actual movie by a great deal. There was almost more focus on how cool Palkia is in the video games than on who this Barza guy actually is, which probably isn't the best way to get people into theater seats.
Sounds interesting I mean if I was a kid the legendary pokemon events would interest me more than the movie too. ^^