I'm sorry but that's just wrong. Napolitano doesn't parrot the Republican talking points and that's why many don't like him. He's probably the most conservative person I've seen on Fox News yet. And if you check his 'knowledge of the law' you'll find he agrees almost word for word with the Framers of the Constitution. But of course those are just the Framers, who are they compared to today's Republican leadership.
That would be your opinion. For contrary views, click here for National Review articles regarding Napolitano.