After owning a 2009 altima, and now a 2011 370z, I can say that Nissan is a a very good company in my eyes. They make quality cars, ones that are affordable, safe, reliable for the most part, and stylish (imo).
If there is one thing Nissan can improve on, then it is their customer service. They dont offer the same quality customer service in their dealerships, parts department, or service department as well as some of the other companies I have had experience with, such as Toyota and Infiniti.
Other than that, I am still a fan of their cars, and I would def buy another Nissan in the future.