The Buick Cascada, known to Europeans as the Opel Cascada, appeared on North American shores for the 2016 model year, offering buyers (and renters) a pleasant, four-seat replacement for the discontinued Chrysler 200 drop-top. Now wholly owned by France's PSA Group, not General Motors, Opel...

Front-wheel-drive, soft top, four-cylinder engine, hefty curb weight- the ideal car for the Enterprise Rent-A-Car lot at Miami International Airport? Not so. On sale since January, the Buick Cascada has attracted 6,154 individual U.S. buyers over the last ten months. According to Buick...