A firm suspension, wide 17-inch wheels, responsive four-wheel-disc brakes, and a punchy engine are important ingredients in a sport sedan, but do not a sport sedan make. The Pontiac G6 is a respectable and roomy four-door, and could even be called entertaining at times, but GM has a ways to go before people who love the journey as much as the destination clamber from behind the G6’s wheel and proclaim it to be a fun car to any and all who will listen.