The 2010 Cadillac STS defies the stereotype of a huge Caddy sedan that handles ponderously, where the back seat is the place to be. The STS offers handling that defies its huge size, athletic poise thanks to its magnetic ride control, and a bold look. The "Cadillac STS" is the driver's car.But the Cadillac STS has suffered quality problems, with many reviewers citing questionable interior build