This is why these forums are detrimental to some people. Looking at your screen is a lot like looking at mine. Where overall it looks perfect, but if you look hard enough, while squinting, while jumping on one foot, you may see just a hint of a warmer tint off to the left. But only if you really think about it. It sounds like this issue is legit, but some people are more sensitive to it than others. I'll post my screen next to my Lenovo laptop screen so you can see what I mean. I love my tablet. I do not feel that it is defective. Is there a slight warmer side? Probably. Is it worth the headaches of returns? Absolutely not, it in no way affects my enjoyment of the device. I only notice it if I try to, and half the time I think I'm imagining things. I'd be hard pressed to get someone IRL to see it too.
My tablet is at about 40% brightness here in this picture:
Image
When I crank up the brightness another few percent, it is as clean as can be.