Rod Lurie hasn't made many films, but when he does they tend to full of ideas without any real insight or thought - like a bad film critic (which he was) who throws everything at the wall and sees what sticks. The question that lingers in Nothing But The Truth is just what it's trying to be - a film about journalistic integrity, a film about the Valerie Plame incident or both plus more? Save for his incredibly weak and unnecessary Straw Dogs remake, this is a common problem of his. He also cops out on the Plame side of things by making the character so shrill and unlikable that very little involving her matters.
Rather than have a broad, versatile and debatable opinion on such issues like, you know, a film critic might, he instead weighs heavily to one side and stays there. And his work is all the worse for it.