I don't think too many thought Smith would last long. I know I certainly didn't. To be fair to him though, he was doing fairly well in First Class cricket, so he at least deserved his chance and made the most of it. Technically Shaun Marsh looks like he belong a lot more, but it goes to show how far a great temperament can go.
Interesting to see how Watson goes here. I think it's perfect for him - he's in at a time where his performance with the bat quiet honestly doesn't really matter, which frankly, is when Watson is at his best. I know 2 of his 4 test tons were either when they weren't needed or in dead rubber matches.