Overall, I am extremely satisfied with my 2011 Taurus Limited. Noise and ride are the best I've experienced and it's almost a pleasure to drive to work now! Air conditioned seats are definitely a plus (as I found out during a recent heat wave here). Great transmission, shifts when it should and so smoothly, too. Only negative I noticed was a very slight misalignment of the drivers door, vertically.
Exterior styling, AC seats, backup camera in rear view mirror, keyless start, dash layout/controls, memory seats/mirrors.
Lose the "paddle shifters" and make it so the shifter can be used manually. How about a touch sensitive door handle (as my '09 Mazda 6 had), so you can unlock and open it without having to touch anything else? Maybe slightly better dash materials (lose some of the hard plastic).