Honestly, we bought our Fusion because it was priced significantly lower than the Camary and Accord. With just over 4K miles, it has exceded all of our expectations. We've averaged over 23 mpg city and 32 mpg highway, which is a bit better than EPA estimates. It drives quite well and handles very well in traffic and on turns. Our family of four just returned from a week long vacation and we were able to fit comfortably inside with all of our stuff! We've had no problems so far, although SYNC has had bad voice recognition.
We love the Sirius radio (kids love it too), and the display of "miles to empty" is nice. The back up assist is great if you parallel park often.
Mileage has been better than advertised, but could be better. This is Ford's best vehicle. Why not put the best engine in it? If they made a hybrid version, I'd upgrade in an instant. Also, not to be picky, but the receiving end of the seat belt needs to be longer to help put the car seats in.