Like everyone else, I too have had to have the rotors replaced because they were warped.
There is an intermittent short in the CD player. At times it refuses to play CD's and says "error" on the display, yet while empty it will spin and the laser will move back and forth whenever any button on the radio is pushed. Also almost all of the lights on the radio no longer light up.
The fog light on the driver's side keeps burning out. The last one only lasted 2 days.
The brakes tend to make noise even when there is nothing wrong with them.
I absolutely love my Malibu. I abuse it badly and forget to take it in for much of the maintenance it needs yet it always starts right up and runs well.
The interior is very comfortable. Every passenger I have had in it has made comments on how much they like the inside of the Malibu.
It has very good takeoff power and is great for passing other cars on the freeway. The overdrive is very responsive.
The driver's side cup holder is the absolute worst cup holder ever. If your drink doesn't end up in your lap during a turn it will definitely end up on the floor when you try to use your blinkers.
I totally agree with the driver's side cup holder. It doesn't work very well. Thankfully, there is many others!