Good considering it's old
It's now 2017, so the 2005 Sonata is 12 years old. It runs well, but at this point, we are bringing the car in to change out rusted parts every couple months. I got the car used in 2013 so I'm not sure how it ran brand new. When I got it, the CD player didn't work and the latch that opens the gas cap didn't work (we have to access it through the trunk). These don't really affect our quality of driving experience... The only thing I don't like that I imagine has nothing to do with age is its acceleration/horsepower - sometimes I need to merge onto the highway quickly but it's kind of slow on the pick up and I feel like that is a safety issue. Other than that, everything else works well, including lights, blinkers, radio, AC, heat, pretty quiet engine, sunroof window... It looks nice, too.