I think it's a good pick, too. Not only because of Watson's record and personna, but he's much admired in Scotland.
I guess Larry Nelson was hoping to be picked, and, on his playing record, he is qualified. But, just because you've been a very good player, doesn't mean you'd make a very good captain. Some folks have the personality to lead a group of highly competative egomaniacs (not meant in a bad way), and some don't. Plus, I guess Watson's been more involved with the "younger tour" than Nelson.