8: Chevy Beretta
The Beretta was based on the Corsica, and the initial premise of the car was to replace the Camaro. Similar to how Ford had hoped the Probe would replace the Mustang. The Beretta was a letdown in terms of performance and most consumers were disappointed. Not to mention the fact that Camaro loyalists were not going to give up on the car for a V6-powered Corsica clone. This car marked a decline in quality for GM (via Best Ride).
While there were other options on the road in the same segment the fact that GM tried to replace the Camaro was troublesome. There was nothing remotely appealing about the Beretta. The car would end up being discontinued in the 1990s and the Camaro was eventually discontinued in 2002.