I LOVE my 2008 Fusion which I purchased with 38k miles. I love the performance, ride, SYNC is fantastic, the styling of the car and especially the solid feel. Never had a problem with the Ford and they're still much in demand today. I expect to have years of pleasurable driving in my Fusion.
SYNC is my number one favorite feature. Being in sales and spending lots of time in my car this is a wonderful technology. Styling is great - I have the V6 SEL with sunroof and spoiler. Smooth, quiet ride and V6 acceleration are also much appreciated.
At this time I cannot think of any suggested improvements. Rearward vision is not the best but this is a result of the body styling more than anything else but I'm happy to live with it given the nice lines of the car.