I dont have a 3 but I have a P5 and have been driving a 2010 3 while my P5 is at the dealer. Hear are my thoughts on the car.
Pros, great milage, quite ride, bose sound system is very nice, headlights are hella bright at night, very large truck, glove box that is so large it looks like you could crawl in it.
Cons, seats are two narrow at the shoulders and to me very uncomfortable, remote key combo weights like 10lbs (ok its not 10lbs but its stupid heavy in your pocket), side view mirrors are an odd shape and I do not like the view they provide, steering feels very touchy (seems like its got to much toe), dash extends into passenger space a bit to much feels like your cramped.
Those are my thoughts..