I own a saturn Aura (same platform as the Malibu and G6), and I find that the parts are cheap, readily available in aftermarket form, and easy to replace. Yes, I did have to do the wheel bearing ... but it took me an hour and a half, end-to-end. Super easy hub design to repair, and the entire hub cost me $40. I compared prices brand-to-brand for a 2007 Camry, and the camry hubs seem to run about $30 more than the hubs for my '07 Aura.

Anyway, I also wonder if people who prefer certain makes or models are more likely to do their own work, also skewing their reliability data.