I'll give you the same answer I give on all threads regarding this "issue".
There are millions of retina MacBook Pros in the world, tens of millions in fact. What you see online and in forums is a (very) vocal minority of users who report issues. Forums are mostly used by people who are trying to find a solution to a problem. So if you go on any forum regarding any product, most of what you'll see are various issues about the product.
Nobody bothers to look up a forum dedicated to a product, sign up, find the correct place to post in to make a thread "Hey, mine works fine!". That just doesn't happen.
You are very likely not to experience a single problem with your computer.
Once you do get it, don't scrutinize it for any tiny little imperfection. If you look hard enough, everything you own has a few. Don't install monitoring apps. Don't go checking battery cycles, screen manufacturer, etc. Don't fall into the endless pit of OCD-like behaviour a lot of users on here have. Just use the darn thing. Don't let anything take away from the enjoyment/usage of it. If nothing's readily apparent when you take it out of the box, then you're fine.
If your machine has any problems, it has a warranty, make use of it should the need arise.
