This was my second Malibu - had a 2004 totalled in accident. Loved the 2004 so much I wanted nothing else besides another Malibu. Have had it over two years and put 52,000 miles on it, and never had it in the shop other than routine maintanence like oil changes and tire rotations. It gets better gas mileage than even some 4-cylinder engines.
Sound quality for a factory stereo is exceptional, best I've heard in a standard family sedan. Manual shift buttons are nice, and hard to find. A/C cools quick.
Car is not the most comfortable. Seats are too firm. Wish the adjustable pedals were standard, miss those from my '04 Malibu. CD Player, although sounds great, is very picky. Some CDs won't play, even though they work in other players. Overall, though, this car has little improvement needed.