The problem with minivans is that they tend to look a lot like minivans. That's why we were so excited when we saw Nissan's Quest concept at the 2002 Detroit show. For the first time, someone had something different -- daring, even. One year later, the production version has watered down the original striking shape. The concept's defiant beltline kick has now been softened to a limp upward swell, the narrow and aggressive headlamp treatment has gained a sad-dog look, and the still-pretty dash that had been a model of simplicity and elegance is now festooned with the usual panoply of buttons.