The blue tint is noticeable when you're looking for it, otherwise I pretty much forget about it. That being said, I don't think the screen is a good as the one on my iPhone 6s plus.
I went and looked at an iPhone X and was blown away by the screen but I didn't like the size. I had read the negative reviews about the screen on the 2 XL and figured if it was just somewhere between the screen on my 6s plus and the X I would be happy. However it doesn't seem as sharp as the 6s plus and the whites are more of a gray to me compared to the 6s plus.
However, unless you're looking at them side by side, you'll never notice. To me, the screen is far from a deal breaker, but it's certainly not a reason to purchase the phone either.