Uh oh.
Now you've done it.
His thoughts are fair enough based on personal experience, but it's that good old thing where people base their thoughts on a whole company's line of products on a bad experience they had with one or a few items.
His point about the cooler is also fair enough, AMD's reference coolers often have been crap, but the flip side of this is that non-reference coolers and designs are typically out very quickly.
I'm going to put the cat amongst the pigeons here and probably take some flak for this but i believe AMD's drivers in terms or performance and stability are on the way up and if recent feedback here and elsewhere is anything to by Nvidia drivers seem to be heading in the opposite direction. Infact AMD drivers have been superb for some time now in my opinion. I've only just got crossfire, but so far I've had zero problems with that either.
I've said this loads of times really, but I've barely had any driver issues with AMD or nVidia cards I've used, and when I have I know they're my own fault, flashing the cards with a dodgy BIOS, or dodgy overclocks and whatever.
AMD have been putting a lot of effort in lately with their software side of things and that can only ever be a good thing.
Realistically though, if anyone has a track record of flaky software it is decidedly nVidia, there's just too many documented cases of nVidia drivers doing things they really shouldn't, like for the second time they rebranded a set of cards, they released a driver that fried some graphics cards. Call me cynical but that's happened one too many times to call it a coincidence.
Though I do understand and appreciate that they may be extreme situations, and in a typical fashion the vast majority of people are going to get on fine with either set of drivers.