The 2015 Audi A6 prioritizes performance over a cushy ride. That makes it fun to drive, especially when it's equipped with the supercharged 3.0-liter V6 engine, but it trails luxury rivals in overall comfort. The interior is downright lavish, however, with impressive materials and construction. Newer models come with more power, but the 2015 A6 can quickly bring a smile to your face.