Naturally, when the credits for L'Arc~en~Ciel came up, I made a complete fool of myself, but I don't mind. It was so cool.
The movie, too, was really worth it. I enjoyed it, and would definately recommend it to anyone, not just people who played any of the games. Impressive animation, pretty good story, quality voice actors (I can't disagree with the choice of Ming-Na for Aki...c'mon, she was Mulan!).
Go for the movie. Stay for the L'Arc~en~Ciel.