OK, so here is an example of the poor PQ I'm seeing with Man in the High Castle (SDR version). The first shot scene is from one of the alternate realities, so I'm assuming that's why the color pallette is that awful teal/orange combo. Notice the extremely light black levels.
The second scene has more normal colors, although still a bit blue. Again, the black levels are elevated and the picture just looks washed out. It's hard to get photos to perfectly match what I'm seeing, but these are fairly representative. It looks like I'm watching a projector in a bright room; that's how washed out some scenes look.
The correct brightness setting for my set is 45, but if I want this show to look like content I'm used to seeing, I have to reduce brightness to 35-40 (which of course is wrong). These problems have to be with the Amazon app or the mastering of the show, because this TV can produce excellent PQ on other content.