I tend to find that it can take me a 2 or 3 days before I can 100% say everythings okay, by that I mean, it can take a couple of days before somethings gets noticed.
When I tried my new iPad3 later on Friday 16th the release day, everything seemed fine.. I gave the screen a good check, for bad pixels, everything looked 100% ok, but over the weekend I spotted a small 1mm spec of dust (under the screen glass), showing up on the screen like a tiny short hair 2" in from the side, and once I knew where to look it was easy to spot, especially on white or light grey screens, you could barely see it on other colours or anything else.
So how come it took me almost 2 days to notice it... very strange, but like a bad pixel... once you know where it is.. you can't stop looking at it...lol
It got changed today, and this one seems okay, though it does have very minor light bleed in couple of places, but for normal brightness levels it's not visible at all, infact I checked my iPad1 today which I've had for well over a year without any issues at all, and was surprised to see that it actually has slightly worse backlight bleed than this iPad3, and I wasn't even aware it had any at all...lol So perhaps we need to ask the question.. were you happy with your new toy and enjoying it before you started reading about other users iPad faults and comments that they were allegedly having...