Lea: The Unity design process (and how you can play a part in it)

That depends on your definition of a "good" UI. What's suitable and "intuitive" (that word...) for someone who's never used a computer before, or who's only used one UI in his whole life, will not be the most suitable for a veteran user who doesn't need his hand held all along the way. "Wizards" are great for people who don't know how to use a computer--but they're absolutely detestable to other users.