Since when is OC a good idea or solution?
when it's supported by the manufacturer, and thus covered by their warranty.
my video card is factory Overclocked, actually, and I haven't had any problems (well, aside from when the fan failed and I underclocked it back to the standard speed for the chip... and the nback again after finding out the fan was broken and replacing it), and another time after about 2 weeks straight uptime (starting/stopping Direct3d, openGL, as I played games and such) it crashed spectacularly... other then that it's been a solid card.
Now, if they recommended overclocking a card manually(that is,a cheaper card and overclocking past the factory preset), then I would have to agree.