Mine wasn't just about the vehicle, it was the experience as well that made it bad!
Vehicle was a 1978 Ford F-150. It was 4x4, lifted, dark metallic green. Perfect for a naïve 17 year old
I traded a '93 Ranger that needed a motor for it sight unseen. Well, they failed to show a photo of the right side of the truck..which looked like it was driven across a mountain. Literally the whole right side was mangled and awful looking. I still made the trade, as the Ranger was no gem itself and had no motor.
Truck ran ok on the way to my brothers house, which was maybe 20 miles. I started feeling really sick that night, slight fever as well. Next morning, I woke up feeling very sick and on top of that, the truck wouldn't start. Finally got it running after half a day and made the drive home, which was 80 miles. Once I was home I found out the reason I was so sick, I had a cyst that had gotten badly infected. The truck was still not running well, needed constant work over the next couple of weeks or so. Carb caught on fire a few times.
One day a few weeks into miserable ownership, I was pulling into a gas station and it stalled followed by some noises. Well the carb had caught fire again! I walked into the gas station and with an indifferent tone asked the cashier if I could use the fire extinguisher. Put the fire out, and got a few hundred dollars at a junkyard for it.
Long winded I know, but that was by far the worst vehicle ownership experience I've had.