I mainly said that because all of my friends have had an ATI GPU sometime in their lives and they have always been utterly let down with graphical glitches, crashing, and failed boots. On the other extreme, I have never had any problems with my Nvidia card.
The latest nVidia drivers have caused me to have to delete the drivers through booting through another hard drive on 2 separate computers, with 2 separate video cards.
In one case, the driver triggered an irreparable incompatibility between itself, the OS and the mobo. That computer is now unusable.
I have an ATi now, and have no problems at all.