Ok,..some explanation in order here.
NVidia has never built thier own video cards, unlike ATI. So what happened was vendors would build NVidia cards, and use cheap RAMDACS which caused poor 2D quality. It also caused poor 3D quality, but most of the games of the day hid it well.
ATI never really suffered this as they always controlled what went into thier video cards. They have always used better quality RAMDAC's than any NVidia card. That is just a simple fact.
Now comes in the NVidia NV30 family (FX5xxx). For all its problems, this chip did one thing for NVidia. They finally built the RAMDAC into the chip. From this point forward NVidia's 2D quality has almost been as good as ATI's. I say almost, as the FX5xxx family did/does still have some noise issues, but nothing like the previous cards.
The FX6xxx family finally got it right and I would say thier 2D quality is about as good as ATI's.