Let's face it: GM wasn't fooling anyone. It was immediately clear that the G5 was nothing more than a rebadged Chevrolet Cobalt Coupe. This type of badge engineering is one of the main reasons that GM suffered so badly in recent years. Badge engineering really hit its stride during the Roger Smith days. Over the course of his tenure as GM CEO, he was instrumental in cost cutting measures between the GM brands.
This led to catastrophes such as the Cadillac Cimarron (it's almost too painful to even mention). When the G5 finished production in 2009, hardly anyone noticed simply because the game was up. Badge engineering had taken its toll on GM and buyers simply didn't fall for the borderline marketing scheme. Why would anyone buy a rebadged Chevrolet Cobalt with a Pontiac emblem and pay more money? GM learned the hard way.