I agree; Viggo was great for that role, but he had way too many insecurities than the original Aragorn. In fact, I've actually heard that Peter Jackson had once approached the idea of the Mouth of Sauron being an attractive woman to tempt Aragorn. Bad idea. And I, along with all the other fans, love how the Mouth came out in the extended movie. I don't really like how didn't claim diplomatic immunity, as he did in the book, but I can understand the reasons why Jackson chose to stray away. Readers don't know what happened to Frodo at that point, whereas movie viewers are perfectly aware he's alive.