Nothing.
It is a pleasure to drive and the ergonomics are well designed. I have taken extended trips in very fine comfort.
Everyone who looks at it says it has a pleasing Euro look on the order of a BMW.
The Australian built engine is responsive and the auto gear shift has a boost button that really adds punch to acceleration when needed. I could go on, but all in all my Nubira makes driving fun.
My CDX is loaded with luxury features. The price is real value. The trunk is huge for its class. My son who is an engineer likes it more than his 2001 Firebird. Bottom line.
I have to say that the 2001 firebird is a much better form of transport blasting all cars out of the water. however I'm sure your right. daewoo nubira's are fine.