I understand your frustration. Facts:
1. I work in an office with a bunch of 16" MacBook Pros that never experienced this issue.
2.Apple has been very amenable to offering exchange/repair programs well out of warranty on clear defect issues since the web came to be.
3.Apple has always offered mail in repairs if you just ask for it.
4.Customer Service/AppleCare doubles as customer relations, and is really the place to vent this feedback politely.
This is just a user to user community trying to help people identify when the problem is user centric, or actual defect, or third party software centric. Please read the terms of use regarding rants, questioning Apple's policy etc...
Yes Apple does occasionally get moderators to discuss issues with you on here. But there is no guarantee when that will happen.
I am an Apple Certified Macintosh Technician and have seen a wide variety of issues that are intermittent and unique just to a set of computers from a certain period of time.
It may be worth your while to consider a Logitech webcam which is Mac compatible to save on time having to discuss the matters with Apple. But do consider buying AppleCare so when the time is beneficial you can have the issue addressed.