I sold Nissans for about a year. I drove an Altima for a demonstrator for about 3 months and have never driven a better value. As soon as my wife graduated college we ran right out and bought one. There are nicer, more expensive vehicles out there but for the money you will not find a better buy. Any problems you find on JD Power's website are almost certainly the salesperson's fault for not explaining fully the car's features and how to opperate those features. Remember that they only count "problems", which could range from a blown engine to how to open the fuel door. Don't fault the car for an incompetant salesperson. You can't go wrong with the Altima reguardless of trim level.
Very powerful 2.5L 4 cyl. while still getting up 35 mpg
My only complaint is that ABS is still optional on the 2.5S. Come on Nissan, you've ALMOST designed the perfect car