It is fast food, but it's good fast food. I was a little disappointed the first time I went to the Wolfgang Puck Express as well, as I was kind of expecting it to be fine dining before I got the concept. Once I knew what I was getting into, though, I learned to love this place.
The quesadillas and the pizzas are awesome, and a few of the pasta dishes are great. It's fast and affordable...not as cheap as McDonald's or Taco Bell, but the food is substantially better.