I think the movie needed someone with a strong villain voice thats all .voices like keifer Sutherland (phone booth),James spader ( The blacklist) or maybe Michael Sheen (unthinkable). Besides that the movie was not bad at all .Mel Gibson played his part very good as a lead character.i mean its not a bad thing to select or give new coming actors and actresses a chance but sometimes its wise to select the best quality so that your movie can sell. I still have faith in you. I mean Quinton Tarantino invested/picked best characters in Django and took awards for that...I think you can also do better.
Review of On the Line
