Casting & Directing

How important are casting & directing choices to the overall outcome of a movie? Can a fantastic script prevail even when dragged down by a director or cast that doesn't get the intent of the writer? Or can a terrible script be redeemed by a visionary director & superb cast?
That's what we are here to discuss today!

Question of the day: what movie do you think had potential, but were let down by the director? OR what movie did you expect to be completely horrible, but the director turned it into something worth while?