Hexus had a chat with two AMD managers regarding the image quality controversy in the latest Catalyst drivers, you can read it over here.
Dave acknowledged that some sources had observed visual anomalies when running a few games and benchmarks. He explained that the algorithms that the drivers run - notably anisotropic filtering - are very complex and that despite their best efforts, the image wasn't going to be perfect 100 per cent of the time, even on default settings.
What he stressed was that, in the opinions of the whole driver development team, the default settings and optimisations still offered the best performance with no noticeable drop in quality for the vast majority of users the vast majority of the time. And for those who were experiencing any problems, High Quality mode would always be there to allow a picture perfect image. This, he made clear, wasn't going to change any time soon.