11: Buick Riviera GS
The Rivera GS is known as being the early precursor to the Grand National, but early models had their fair share of drawbacks. First was the heaviness of the design. The vehicle was a literal wedge on the roadways. Then you had the engine, which was underpowered compared to other muscle cars of the period. There was also the fact that the Riviera GS was much more expensive than its competition.

The interesting thing about the Riviera GS was that it has an iconic design. When drivers think of Buicks from this era, they think of the Riviera. But the reality of it is that the design is somewhat problematic and a lot of owners had headaches dealing with this car. Avoiding the Riviera is probably the best thing when it comes to a muscle car.