There has been absolutely nothing wrong with this car since the day I bought it.
I recently took this car on a 1000 mile trip and it was a dream, averaging around 33 mpg, at 85 mph. very comfortable and exciting trip.
I was surprised the Alero got such a high rating. I have had the 1999 Alero for 3 years and cannot begin to count the number of problems I've had with it. As far as reliability, I rate it very poorly. It rarely starts on the first attempt and the security light flashes off and on for at least ten minutes thereafter. I've also had the key get stuck in the ignition switch so that the car would not turn off. At one point the car would not lock except from the outside remote. At least every 6 months something goes wrong and has since the first day I drove it off the lot, when the button to adjust the bass on the radio fell off. Best of luck with your Alero.