I give this movie a 10 only because that is as high as the ratings go.
The actor who plays the one and only part in this movie, Grégory Gadebois, should be given every acting award on the planet. His performance in this movie is astounding.
It is the story of a mentally simple man who undergoes an operation, becomes very intelligent, and then, slowly, sinks back into simplicity again - except that he knows he is literally losing his mind, or at least his intelligence.
Grégory Gadebois's performance never seems like acting. We feel as if we are watching someone who is actually going through this. I can't remember the last time I watched a movie without leaving my chair at some point to do something. I could not leave my chair for the duration of this movie. Grégory Gadebois's was too moving to miss a moment of.
I won't tell you this is an easy movie to watch. It's not. But it is so "true." From early on you like Charlie, the character, and from then on you don't want to miss a moment of his struggle.
What a truly remarkable movie.
P.S. The script is very good, and the cinematography is extremely intelligent.