I haven't calibrated it yet, so I can't really talk about the color accuracy.
If you and I noticed the same things, then I guess that just reinforces the observations. With such a small sample pool so far, it's hard to know what is unique to a given specimen and what can be generalized across the line.
Until my wife relinquishes the monitor to me for further evaluation, this is the best I can do. The backlight uniformity test in darkness will be the defining moment.
It's not necessary to calibrate it to see issues.
Calibration won't help if a visible issue is present.
What you need is a second monitor.
Thank you.