I do wonder if I'm just unlucky enough to get bad screens every time I buy an Apple product, or if my eyes just pick up on things most people don't. The weird thing is that I have a handful of computers/tablets from other brands that I have no problems with. The crazy thing is that I keep buying Apple stuff. haha
It could be both. Perhaps you had a bad run on a few devices in a row, and now are overly sensitive to it and discerning for the issue every time you get a new one.