1990 Chevy lumina. The brakes were terrible, it was one of GM's early attempts at 4 wheel disc brakes. The rear calipers would freeze so that all the work was done by the front brakes. Once I had a scary event where the calipers froze partially closed, riding the disc, and boiled off the brake fluid. Tried to stop, the pedal just flopped to the floor. After many brake jobs, I finally got rid of it when the gutless, noisy, rough running 3.1 V6 blew. The only plus is it never rusted.
I still have my 97 Tahoe, so I can't call it junk. It is becoming expensive though. I've learned I shouldn't have bought a 1500 series truck, the 2500 is better. Too many corners were cut with lightweight systems like brakes and transmissions that aren't up to the job. After 18 Midwest winters still almost no rust, which is impressive. Still runs good.
I doubt I will ever buy another GM car, they are built too cheap. Very low quality materials for the interiors and brakes that barely work are the main reasons. Their V8s are excellent, 6s are hit or miss depending on which one. I've never driven a 4 that I would put in a lawn mower, let alone a car.
With everyone downsizing engines, I need to find a new car before they are all junk.