According to Macrumors, some users think that some of the 15 inch screen version of the MacBook Pros have grain and noise particularly when you look at bright colours.
One punter said that it was like taking a screenshot of your screen and adding one percent noise to it.
A screen shot was posted to the forum here.
Ironically, a PC user thinks that it might be a problem with the Intel GPU and not the display itself and the problem can be fixed with a VGA BIOS update.
Others claim that it is a feature of Apple's screens which come with an anti-glare coating. They say if Steve Jobs tells them it should be there it should be.
However, others are miffed that when they tried to complain to Apple, they were religiously ignored. ยต