Just purchased my Sorento two weeks ago and although new, I'm very pleased with my purchase. The most common complaints that I've read are ride firmness and mileage.
While I agree that the ride is a bit firmer than I like, the trade-off is better handling...less sway, roll and pitch.
I got the six cylinder because I wanted more power (I live in Colorado and glad I did).
While people complain about the poor mileage, I've owned a number of six cylinder vehicles in the past and the Sorento mileage is about the same - 300+ miles per tank of city driving. Beyond that, this KIA drives, looks and handles like CUV's for thousands more! I'm VERY happy with the looks and feel - a great value!!!
Plenty of power and more fun to drive with a six cylinder, Bluetooth, Syrius, IPod integration, third row seat (if needed in a pinch), great looks (Bought it in black with tinted front windows to match the back windows), fit and finish.
Wish it was slightly less firm ride and had a sliding second row seat.