Mercon LV tends to darken quickly, and since your Fusion has the 2.5 liter, I'm also going to assume it has the 6F35 trans, which is also known to be hard on fluid, so it makes sense that it would be that dark at 30,000 miles.
You did your part. The drain & fill @30,000 miles has gotten my 2010 (also with the 2.5 liter and 6F35 trans) to 229,932 miles, as of tonight