It's not the grainy nature of the screen which is causing the viewing problems, it is as said by others the excessive coating of anti-glare which causes whites to appear grey, if the brightness is turned right down and silver at mid to high levels of brightness. It is impossible to get a proper white to display on these screens.
For instance, on this site, it is hard to tell the difference between the grey background to the left of replies where avatars sit and the reply boxes themselves. It all sort of merges into one. The difference is particularly pronounced when running Windows, where the smaller system fonts appear blurry, because of the lack of contrast from all of the shimmer.
This is not restricted to Apple. I had a look around PCWorld (UK's answer to CompUSA) and noticed the same problem with a lot of current laptops - particularly on a lightweight Samsung model, which looked every bit as bad as the MBP C2D.
I suppose that the excessive anti-glare caking is a response to higher levels of brightness in current laptops. I could live with the Powerbook levels of brightness and better colour rendition, since the first thing I do with laptops is to turn the brightness down, anyway. I don't think returning the laptop and getting a replacement will solve anything, as the replacement will most likely have an identical screen. I have four Applestores to choose from (live in Nth London - work in Manchester) and all the MBP C2Ds have the same poor panels - whether glossy or matte in all the four stores I visited.[/QUOTE
I also think it is related to the brightness enhancing filter on these laptops that grainy/sparkling feeling. The glossy and matte both have the grain and, when I checked yesterday, the 20" cinema display also has it.
In any case, while it is subjective if it bothers you, if you put the 15" next to the 13.3 macbook or 17" MBP, the difference is too obvious to ignore. Those who say they have no grain either have a very early model with a totally different display, or they just don't notice it. I've been to two apple stores and every single MBP has some degree of grain. Some of them are better than others, but they all have it.
Given the circumstances, I think the question buyers should ask themselves is not "Will I get lucky to get a good display?" but rather "Will I be happy with the displays Apple is currently using?"