Torque Converter Clutch (TCC) in the transmission began sticking at about 60000 miles. Just unplugged it, and the car runs pretty good without it, but your gas mileage goes down considerably on the highway.
Air Conditioning quit at 40000 miles. Would probably still work, just has a leak in a hose, but I never bothered to fix it, then the coolant it uses was taken off the market, so I still haven't fixed it.
When it was new it really had some power. I got it with only 4004 miles on it, so it was still brand new, today, May 2002, it has 89000 miles on it and still goes pretty good, but nowhere near as powerful as it used to be. It's hard to pass someone at 65mph, and nearly impossible to pass someone going up a hill above 55mph.
Rust: It's had quite a few holes in it. Every 2 to 3 year I have to go over the whole car and patch rust holes with bondo. You have to keep up with the rust or it will fall apart, mainly the doors, but if you can do it yourself, you can save lots of money. Keep in mind that I live in Erie, PA, and they use insane amounts of salt on the roads 6 months out of the year.
It's been in a few accidents, none too major, but it held up well in all of them.
At 88000 miles it needed a major tune up. A total of $500 for new brakes and lines, spark plugs and wires, valve cover gasket, most of the sensors (oxygen, ect), belts.
When I first got the car, I was learning to drive and I broke the engine mount on the bottom TWICE, while learning to parallel park.
It sucks oil into the air cleaner from the valve cover.
The oil filter is difficult to reach to change it with out removing the wheel.
I have to use premium gas so that it runs good. If I use regular it stalls.
You have to remove the whole dashboard to get the radio out to replace it.
Its good for riding around town, but not great on long trips. I drive it an hour each way to work and back, and it get uncomfortable. Seats are soft, but they don't offer too much back support. The steering wheel is fixed in position, no tilt.
Overall I have to say that's its not that bad for a nearly 20 year old GM car.