2001 BMW 3 Series 330Ci Rwd 2dr Coupe (3.0L 6cyl 5M)
Bought the car in 6/04 when it had 41k miles. Engine has always performed flawlessly. I have the 5 speed manual and it has always been extremely smooth and fun to drive. The car though has consistently had minor cosmetic problems and once these cars have over 80K miles they are VERY expensive to have serviced. Once you pass 100k miles a lot of stuff has to replaced and in my case it's all come up at the same time. With the repair costs approaching half the value of the car, I'm not sure if I want to hang on to it. I still love BMW but whenever I get another one, it will be a new model on a lease so that maint will be covered. Stay away from late model units... too expensive to maintain!
Acceleration, handling, interior/exterior build quality, consistency in performance.
Hard to think of b/c mine is so old (2001) and the newer models are greatly improved. Maybe make the car easier & cheaper to service, that would be helpful.