Every single air has that issue. It is because the lighting for the device is on the right side only, thus producing a brighter right side and dimmer left side. You won't find an air that does not look like that, although some are more pronounced than others.
I would agree. I've yet to get it clear in my head whether it's a limitation of the technology or a design flaw. I suspect the compromise of shrinking everything down meant the display could only be backlit on the right hand side and as such, the left hand side is dimmer. I don't think it's necessarily yellower, just dimmer, which gives the yellow impression.
Either way, it's still irritating.