For those of us "old timers" in the industry and consulting (moi since 1970 and GUI systems since 1984), ATI was and to an extent still is a disaster in drivers themselves. I and others nearly lost our companies and were on the verge of being sued for various ATI driver disasters, but have to say that we never had that happen with Nvidia (er, yet!)
Yes, it is true, however, that now there's more video parity, with both ATI and Nvidia performing both periodic wonders and periodic disasters.
Nvidia is cutting staff and corners now, and have been in the past, and all are suffering for it. Unless Nvidia runs out of people or finances, they are still the overall "better" products, chip-sets and drivers...but they are making us all "suffer" while that fact becomes clearer, albeit in fits and starts.
Sadly to say, AMD bought out the wrong video company...they should have met Nvidia's request and bought Nvidia...as ATI may well cost them the company and eventually the trust of the industry and the users.