It's not normal or acceptable at all is it! £2300 for this? No thanks.
Hate to break it to you, but it is normal for IPS.
If you are saying "for £2300 Apple should have used OLED" I'd agree.
But, for £2300, using IPS, what you demonstrate with the latest picture IS what IPS is like. If your picture is accurate I would say it is what one should expect with this sort of display. If you exchange you
might get
slightly better, or you could get
slightly worse. But, it is impossible to get one without some of this.
EVERY IPS based screen has this problem.
Given the physical design of the laptop, and the screen tech, the problem is not Apple QC, it's inherent to the nature of the screen.
I would say the best you could hope for is a drop of maybe 15% less 'yellow' on the bottom area you demonstrate. Better than that and you have just about the best IPS screen possible.
I'm not defending Apple! IMHO for the cost they could have used OLED. But, I have had tens of IPS screens, they
all have it. You just have to decide if the other advantages; general colour quality, lack of OLED 'dark pixel patches' are worth the tradeoff.
Folks, if you want to really scare yourselves with your new Macs, get a notepad app open window about 1/4 the size of the screen. Then drag it around fairly quickly. You'll notice some darker patches than others. THAT's IPS. I don't look anymore, it'll just drive you mad

[doublepost=1480192182][/doublepost]p.s. the iPad Pro 9.7 (whihc I have) is the only screen I have seen with, say, better than 80% gradient consistency but...
1. It changes colour temp and
2. It is a smaller screen.
YES Apple could put huge effort and extra QC into getting it a
bit better, but frankly they would be the only company selling displays like this (some professional monitors have techniques to hide IPS 'dirty screen / inconsistency' but they are not much less cost than the Macbook Pro itself!
[doublepost=1480192610][/doublepost]P.p.s. This is the best link:
http://uk.rtings.com/tv/tests/picture-quality/gray-uniformity-dirty-screen-effect-dse
And before people claim
"the link is about TV's", First,
it's the same tech, second look at their idea of 'good!'. To them good/excellent is better than most screens posted under "Apple screen gate pt.457!!".