I actually used to own a 99 Olds Alero, which are about the worst car GM, at least they say, built in the nineties, but I can say this one must be made of the same sheet of metal, because it's all Alero revisited, or this one is maybe even worse.
Drivers door seal was loose, and I noticed this when the seat was wet one morning.
Two brake jobs in less than 40,000.
Bad connection in one ignition coil gave rough running, and this one bothered us for some time.
Bad connection in rear indicator light.
When cold the engine goes up and down like it cycles about +- 300 rpm and it's irritating and gives not a very smooth drive the first five minutes. The dealer says nothing can be done about it.
The exhaust system was misaligned and touched the body of the car, giving a rumbling noise when cornering. And this was how it was delivered from the factory!
The paint quality is not very good; at least that's my impression since it scratches or chips for nothing. I just leant against it and my watch touched the upper part of the door, and hey pronto, a four inch scratch that even rubbing wax won't take away.
Dealer is OK at fixing my problem, but I never liked this car and I'm liking it even less now. My wife and daughter are using it and they think it's really stylish. I agree, but that's about the only positive thing I can say about this car, besides that it rides well on highways, but I'm the one that brings this car to the dealer every time something need fixing.
This car feels very unbalanced at speed, and the original tyres are set up for a smooth ride and not performance. The front tires are all worn out now and will be replaced soon anyhow. It's a car that does one thing good at a time; don't try to steer and accelerate at the same time since the torque steer will bounce the car all around. It just feels like this car was made for a much smaller engine with less torque.
In summary I'd say that this car should have had better quality off the factory, and Hyundai should put more effort into fixing the understeer and other issues. My Alero 3.4 was actually better than the XG, but had many of the same issues.