I bought it used in 2005, (Only a few months old) and I think I know why it depreciated $10,000 in only a matter of months. The A/C smells musty, the bottom scrapes everytime I turn into a driveway, my brakes make a strange chirping noise, (Dealer says normal) tranny makes strange grinding noise, (again, normal) the dash pieces are separating, (normal) the carpet pulls away from the lower trim because it was cut too short (normal) GM refuses to fix anything wrong with it. Interior noise is ridiculously loud, I fear that I am making my 20 month old son slowly deaf. No ABS, so when it snows it likes to hit other cars. Heater fries my right foot, yet leaves my left foot frozen solid.
Eventually, I'll get to trade it in, so I got that going for me. It does have a lot of interior room and gets slightly above average fuel economy.
Well, for starters, when the car is falling apart, try to fix it. Maybe have some quality control at the factory.