I recently traded in my 2010 Kia Forte for a 2013 Nissan Sentra, but I only traded it in because it was high in miles (over 100k). Otherwise I would still be driving it. I was a little leery about buying a Kia, but I was pleasantly surprised. Mine came equipped with all kinds of toys: Bluetooth, Sirius satellite radio. Acceleration was more than ample for passing.
Satellite Radio Ready
6-way adjustable seat
Not much needs to be improved considering the price range and class of the vehicle.
The only complaints are that the interior materials felt a little cheap. Also, like someone mentioned earlier, the exterior is more dent-prone than normal. I leaned against my car lightly and it left a small dent in the driver side door.