5: Ford Focus
Ford tried for years to stake a claim in the compact car segment, and in 2000 the company finally made some headway with the Focus. The car was incredibly popular, and there was even a rare sport model called the Focus SVT (via Motor 1).
But all that success wasn’t enough to deter the fact that the car still has many reliability problems. The head gaskets would routinely fail in the first-generation models and the timing chain has also been a problem.