I couldn't bear watching it through to the end

I was very surprised, and disappointed, at what I thought was a very amateurishly acted movie. I expected something dynamic, controversial, and last but not least, interesting. Instead the acting seemed wooden (I can't think of a better way to describe it), the characters, unlike their real-life counterparts, devoid of life. The word "amateurish" kept popping into my head as I watched what I could of it - then I just gave up. I'm assuming the actors and creative staff must know what they're doing, but it just didn't come together in this "production". I was almost embarrassed for all the people involved in the making of this film.