Nah there's a bit of to-ing and throwing on this.
Ati have vertex issues, Nvidia has Shader issues - none of which actually effect anyhting other than the Directx9 tests - microsoft has kept schtum over the whole thing.
Ati started it and opened a whole box of nit-picking the most senseless arguments you have ever heard.
It's a marketing storm in a tea cup..
I say those who live in glass houses, should not throw stones