First of all start out with the positives - the car is absolutely gorgeous. It is ruby with tan leather, a very nice combo.
Then engine is strong for a 4 cylinder, but mileage is only marginally better than the 3.5.
The stereo is very good (bose with 6 CD changer).
The seats are average - the lower cushion is a little short.
Interior materials are low grade hard plastics.
Stock Continental tires are garbage in the snow/ice - replaced with winter tires.
Maybe I received a lemon, but I've had more than my share of problems with this thing - poor heater performance, intermittent flooding when cold (especially when humid), the car burns a litre between oil changes (6000KM), and now the car sits at the stealership waiting replacement of a crank position sensor which went south.
Overall I would say that this car is a rather large disappointment, especially considering I took a chance and bought it instead of a comparably priced accord or camry. I will try my luck with an American car next (considering the Altima is built in America anyway).