I purchased my Altima new and after more than 9 years, it has been the most reliable vehicle that I have owned. It had over 100,000 miles before it needed a repair that was not a routine maintenance item. It currently has close to 150,000 miles and I plan to get one more year out of it. Nearly everything on the car still works as well as it did when new. Quality is even better than my Toyota Camry which I had for 7 years. I would definitely buy another Nissan.
Reliability; smooth transmission; quick for a 4 cylinder; fit and finish especially of the interior.
The next generation of Altimas are greatly improved. The 2000s are still a good buy as a used car.