We always say something like this in forums like these, but:
Don't assume that the posts in these forums about backlight bleeds (or any other problem reported by users) indicate a widespread problem. User forums tend to be like Emergency Rooms. People go there who are sick. But we don't conclude that because there are lots of sick people there, that everyone is sick.
Sure, some people have trouble with backlight bleed on their panels. But that causes lots of other people to wonder if they do too, so they duck into a closet, turn off all the lights, crank the brightness all the way up and invariably find a few areas of light bleeding. The question isn't whether you can achieve this kind of phenomenon in your tablet, or whether, if you can, it's defective and needs to be replaced. The question is whether, under normal, real-world usage circumstances, when using your iPad for regular purposes, there is a light leak so glaringly noticeable that it interferes with what you're doing.
For some people, this is the case and they've reported that here. For others it is not. I would venture to say that the same thing is true that was of other problems reported on Apple devices in the past - the hype is generated by only sampling reports from the user forums where people who post typically have problems. The trouble-free users (who comprise the vast majority of overall users) are happily using their devices with no need to post.
My iPad2 works wonderfully. If I turn all the lights out and max out the brightness, I can see bleed spots on the edges. But under normal usage, I can't detect any problem spots whatsoever. When I'm watching movies or reading or browsing or typing, there are no distracting problems with the screen. I highly recommend the product.