To be perfectly honest, I haven't seen so many complaints about the screen since the first models of Ipaq, where it seemed like every single member on a dedicated PDA forum was complaining about dust under the screen - and those screens were really, and seriously fuxxored by that problem. After couple of months, Compaq recognized all those complaints, phased out that model of screen and never used it again. On GA, IGN, and here as well now, it looks like a good percentage of people who bought DS have a dead pixel or two on it. This is a bit unusual for a device with small screen (this problem is a lot more common with monitors as they have a lot more pixels, obviously)
Thaht's why I buy my LCD based electronics exclusively at Future Shop. Their 15 day no questions asked return policy is Godsent for nitpickers like me, who would go crazy over that one dead pixel (luckily I never had such problems so far with my electronics)