And I'm not talking anyone down. But the OP is asking is anyone just accepting it. Which is just pathetic and lazy. Hey more power to ya if yours doesnt have this problem, but Apple is huge company and there is no reason you need to just accept and defective product out of the box.
No one is saying to accept it.
Just to use the device as you normally use it, and only worry about it if you see it.
If you use it mostly in the dark, then you're definitely more likely to see it. But still use it as you normally do in the dark and see if you notice it. If you do, exchange it.
If you never see it, even in dim/dark rooms, then no point in worrying about whether you see it if you turn the brightness way up etc. if that's not the condition you usually do.
Again, anyone who notices it in their normal usage patterns should absolutely exchange or return. But it seems silly to do so if you never notice it in your normal usage patterns and only on 100% brightness on a black screen in a total dark room. That's not normal usage. If you see it in a dark room, watching videos etc., then yeah, that sucks and exchange or return.
If one needs a 100% perfect screen that will show no bleeding even with the screen at 100% brightness during the darkscreen/dark room test, then they just need to give up as it's pretty clear that there are no iPad 2's that will past that test flawlessly. But there seem to be plenty that at least aren't noticeably bleeding in normal usage and that's the best you can get right now.