Great art, not-so-great idea
Reminds of "The Good, The Bad and The Ugly", I guess... and the art is superb, really incredible.
On the other hand, the movie is a little too long for such a simple thing. I mean, I'm sure no one failed to see it coming, there's no explanation, and it's really, really slow...
In other words, amazing artist, but not such a great script.