I bought my Oldsmobile Silhouette new and five years later I am still happy with it. It has had no major problems to speak of. The only time I had it at the dealer was to fix the blower, it had lost low speed and the heater in the passenger seat died. Both were fixed without issue. I replaced the front brakes twice, tires twice, and rear brakes once. I am happy with the accelation also. It isn't a race car but I can merge onto a highway without feeling like I'm going to get creamed.
Its reliability and comfort.
None really. I just wished I had two power sliding doors instead of one but that is my fault.