Not that there's anything wrong with the Fusion, it's just slightly less dramatic.
Sometimes, in order to really appreciate a car, it helps to see how it's made, to literally see what goes into it. This is why Shmee150 has made a video tour of Ford's Flat Rock Assembly Plant, where they make the Mustang and Fusion. The Mustang is obviously the more exciting of the two cars, and it's what the video focuses on. While it doesn't show anything you couldn't see if you took the tour yourself, this isn't practical for quite a lot of people.
Being British, we assume that Shmee understands this, and watching the video is still more convenient than going there. Even for people who live in Michigan.