I'm gonna go out on a limb and just wonder hypothetically:
How many of the "I just noticed my iPad is bent" iPads were left on the sofa, inadvertently sat upon by another family member, moved to the coffee table inconspicuously, and then discovered by the owner to be bent?
We'll never know the answer to this question. The owners will always believe it "just happened" because those whose rear ends are the true culprit will never confess, or maybe they didn't even notice the bend when they slid it out from under themselves. who knows...
anyway, I think its safe to say that these iPads require just a bit more babying than previous iPads but I don't believe any of the hype that there is any significant manufacturing problem. Don't sit on it, lay on it, mash it into your backpack. You'll be fine. After all, it is the thinnest iOS device ever, matching the thickness of the iPod Touch at its smallest 6.1mm
[all this not to disregard that of course every Apple product has a tiny, tiny percentage of quality control issues out of the box]