One Hour Photo respectfully deserves its place in the psychological thriller genre for various reasons. It features Robin Williams as you have never seen him before, playing a mentally disturbed man 'Sy' in such a ambiguous way that you can't help but to feel sympathy towards the character (This also won Williams a Saturn Award).
The movie in itself is visually beautiful featuring a palette with lots of white contrasted with bold colors especially red (has lots of similarities with 2001: A Space Odyssey in my opinion.) This is manifested in the scene where blood flows out of the eyes of an all-white Sy against an all-white backdrop.
The storyline reaches the climax at an evenly spaced-out pace. This movie had me gripped from the start to the end, and had my feelings in a constant twist. The scariest of all was that even at the end I couldn't honestly say if I despised or sympathized with Sy and what he did.
This is a movie that everyone who has even felt lonely, angry or revengeful for that matter, can relate with. Anyone who appreciate beautiful movie stills and who enjoys a good thriller.