I've had to replace the exhaust at 56,000 miles.
I also replaced the engine and transmission mounts at the same time. The car would make a very loud rattling noise when cold.
I had to replace the radiator at 56,500 miles.
When it rains heavily, my alarm system will go off while I'm driving.
My CD player was broken when I bought the car. I then had it replaced, but broke again after two months.
My front grille has fallen off twice due to poor screws underneath it.
The car seems to be slowly falling apart.
I would not recommend a Nissan Altima.
You should try to find the original owner of that car and find out if it was in any accidents as carfax doesn't list accidents that weren't reported. From reading your details, it sounds like that car was definitely in some accident and was put back together by novices.
I happen to own a 2000 Nissan Altima GXE, which I bought brand new. Seven years and 113k miles later, the car still runs, sounds, looks and smells like a new car. I was going to sell it simply to change cars, but I've to buy and still keep this since it's been so good to me.
Moral of the story (generally speaking)... it doesn't matter what car you have, if it was abused by the previous owner, then you've got yourself a lemon.
Good luck.
I currently drive a 2000 altima. For the most part the car runs good. I was in one large accident in 2004 where I was rear ended on the freeway and pushed into another car. Before then I had virtually no problems with the car other than your usual maintenance. But, after that accident the car has never been the same and I seem to be fixing things regularly. I have replaced the catalytic converter, exhaust manifolds, radiator, AC, and various belts. I attribute the problems to the accident and I don't hold it against Nissan or the car.