I have NEVER said that Apple (or any other company or product for that matter) has a zero defect rate!!!! I'm saying that my experience with them has been this - they worked just fine right out of the box. I have had battery problems after a year or so with both my iPhonne 3GS and my original iPad - wouldn't hold a charge. Apple replaced them immediately with new ones - one can't ask for more than that.
What I'm tired of is people saying that these ALL (or nearly all) have wifi problems. That just isn't so! Believe me, I expect a lot, no matter what I have paid, and I expect even more when I pay alot. That's why I've been an Apple customer for over 20 years - I got what I paid for and was very happy. I wouldn't continue buying their products if I were not.
No, I'm not an engineer but I know my way round technology pretty darned well. And remember, Apple is supposed to be the product "for the rest of us" who do NOT want to have to have a degree in engineering or computer science in order to be able to use their products to their fullest!
I'm very sorry for those who are having trouble - it's VERY frustrating and disppointing. Just don't assume that the entire line is deeply flawed.