The Baron beat me to it----the Grand Am was a (ahem) grand car. But it's gone, and maybe Pontiac with it. It had some style and some pop to it. The current Pontiac brands don't seem to have anything that sets them apart.
BTW, I had a Buick for a rental car for four days a few weeks ago. Talk about nondescript mush! If that's what Buick was trying to say, they've definately captured the meaning. ACK!