Many details were missed in my Cadillac XLR. For example, when you raise the trunk lid outside in the rain the water drains off the forward lid and into the trunk. This causes a damp, musty odor and wets anything inside. The electronics on the car are very complicated and the owner's manual is poorly written. If a passenger who is not familiar with the car is left inside without a fob, they can't get out. This is very dangerous in an emergency! There is an electrical drain on the battery. When my car not used 2 or 3 days the battery dies. This has happened 3 times in 18 months requiring road service. Most of the aforemtioned problems are fixable and would make the ownership experience much more enjoyable, but Cadillac has a deaf ear!
The sound system with XM radio, performance, and handling.
Put a drip bead on the trunk. Have a normal person write the owner's manual, include such mundane tips as where and how to clean the sensors for the automatic cruise control.