Saying ati quality vs nvidia quality is like saying sedan quality vs coupe quality.  
It matters completely on the brand.  
If you got a cheapass brand like jaton or pine, then sure, the 2D quality is going to be crap.
But if you got a good brand, like gainward, leadtek, or hercules, then the 2D quality would be as good if not BETTER than ATI cards.
There was a test run by matrox that compared the VGA quality between BBA R8500, a reference geforce4ti, and a matrox parhelia, and ATI came out last, while nvidia came second.
It all depends on what brand it is.  
Stop saying nvidia quality is bad, that's like saying sedan quality is bad.