I have only had a couple of problems with my Monte Carlo.
The first problem that I had was the brakes (4-wheel disc). I think the other reviewer had the same problems. Last spring I replaced all four rotors and pads. That was a little over $400. Then after about 2 months the brakes would squeal or make rubbing noises. So I brought it back and the mechanic told me they were just dirty. Its been going on now since it first started. Another thing was that they should make cars with Anti-Lock Brakes because in Northern NY, it snows and ices and when I put on the brakes it slides. Then 2 weeks ago, the brakes failed and it became real hard to push the pedal. I slid into another employees car and cracked the cheap plastic front bumper and got it replaced.
The next problem is with the headlights. I think they should be brighter and more reliable. I was driving on the highway and I put the high-beams on and was driving and only the high-beams went out, the parking lamps were still on. This has happened about 4 times now. Then on the way to work my message center said HIGH BEAM OUT. So I replaced both beams.
Also, the SECURITY light mysteriously cam on in the message center once along with the SERVICE VEHICLE SOON light. The CHECK ENGINE idiot light has also come on a few times.