Of the many hurtful similes one can hurl at a vehicle, few are more insidious than drawing design or driving parallels to the oft-maligned American sedan. Thanks to the dark days of the ’70s and ’80s, once proud nameplates like Imperial, Impala and Galaxie were either completely forgotten or bastardized into models with about as much personality as a tube sock. Whether you blame it on oil prices, safety standards or the popularity of disco…