Wow, this movie was disappointing. The first half had me hooked with its mystery and action, but the ending ruined it. I haven't felt this unsatisfied with a movie ending in a while.
The "serial killer" didn't get enough screen time, and there was a lack of development for such an important character. Many things were unexplained or didn't make sense, and there wasn't a philosophical payoff to make it worth it.
My password is password.