First the bad stuff -
Dealer service is inconsistent. MOST Kia dealers are great, except for one service department (who I won't name, except to say my opinion of them is BLACK and they BURNed me). I found them rude, aggressive, inconsiderate and utterly unprofessional in every way.
Back to the car...
It doesn't handle well at all and feels like its going to fall over in corners in you get too enthusiastic. Fine for everyday and safe enough for people who never drive hard, but it tried to kill me every time I treated it like a sports car (which it isn't!).
Overall quality is below par inside and outside.
Braking severely affected by poor tyres. If you have a Rio, please put decent rubber on it!
Spongy suspension causes the front tow hook to crunch on many driveways.
Very noisy at highway speeds.
Now for the good news-
Unbelievable fuel economy!!! I regularly get 550km out of 40 litres in the city and over 600km in the country.
Huge luggage compartment. Carries almost as much gear as a large wagon. Not very comfy to sleep in (but better that drink driving).
Zippy performance - no racer, but no slouch either.
Reliability outstanding (apart from faults above). Even when something goes wrong it's cheap to fix. Low servicing costs. Low insurance costs. Cheap to buy. I can't think of a car that's easier on the pocket.
Comfortable seats and driving position. Quite spacious with plenty of headroom.