Nah, panel is fine.
There's a difference between banding/vignetting related to bad panels that they're talking about on AVS (notice the vertical dark and light areas):
And banding of actual content, due to a myriad of reasons; compression, low bitrate etc.
Notice how there are literally "bands" of color circulating out from the center. This is the exact thing that HDR fixes, by moving from 8 bit to 10 bit. However, when you have an HDR set, and you're watching 8 bit content, the TV can only do so much if the original content was mastered in 8 bit.
Hence the game of thrones issue. What's weird, like I said, is that it truly does look very impressive during any day time scenes. There are some shots of things like cobblestone pavement where so much detail is resolved that I'd almost swear it's 4K (but not quite), but there are a handful of dark scenes where banding (as shown in the second picture) is very prominent.
It's just a real shame that S7 won't be in HDR/4K. Amazon/Netflix Originals are slowly eating the traditional "big guys" (like HBO)'s lunches when it comes to 4K/HDR.
Ahhhh, I saw it said add to cart so thought it was in stock. Kinda dumb that you're able to add to cart but then not select either shipping or pick up.