I switched out of a 2001 Ford Excursion into the 2009 Fusion. While I wanted to hate the "little" car, I have driven it for a few days and it is absolutely wonderful. The interior comforts are great and the exterior looks very nice. I linked by Blackberry to the SYNC and it works and sounds great. The car has good power, it is very comfortable, and other than the part about being significantly lower than the Excursion, I love this car.
The SYNC and the ride/handling.
Improve the SYNC feature set to include control of Sirius and radio features.