Saturn Ion
Lots of companies have produced terrible cars, but the Saturn Ion seems like a particularly bad hit. The company was envisioned as a made-in-USA car that could break into the market, although it seemed like a long shot. When Saturn did just that, it was thanks in part to the Ion. Too bad it was clear that the ion was an under-performing vehicle, as its weak engine wasn’t able to handle the massive car, which was the longest four-door sedan on the market. The Ion stopped being made in 2007.