i recently purchased this car used with nissans certified pre-owned program. That being said I cannot find anything inherently wrong with the car design without nitpicking. Yes the CVT transmission takes some getting used to and the stability when driving "spirited" leaves me wanting more. It is to say that this is a commuter vehicle and as such performs its daily tasks appropriatly to its design. No it is not a speed racer and its not ment to be. Seeing that the speed limit in my state is still 70 mph the sentra seems to work well at this speed for long distances. as for anyone complaining about the whirring noise from the transmission at speed needs to just turn some music on.
probably the bluetooth handsfree altho there are many other cars out there that offer it. The CVT tranny once you get used to its uniqueness.
Better handling and better packaging options (if you want one option like say a sun roof you end up having to get like 5 other expensive items you dont necessarily want)