Higher res means that you notice flaws...
OK... I'm a video guy (about 25 years in video, and most of that in video technology). I have seen many kinds of displays over the years, and heard lots of odd remarks from people who used them.
First, when HD TVs first came out, I heard a lot of people claiming that they looked worse than their old SD TV. That was becasue they were looking at an SD signal on an HD TV, and the enhanced resolution of the HD TV meant that they could now see all the flaws (blocky pixels and picture noise) in the SD signal. I also heard some people say that Plasma TVs looked better than LED or LCD TVs. That only seemed true if you were looking at an image (signal) with a lot of color noise in it, becasue the Plasma screens can not display as many colors (as LCD or LED), so you would not be able to see small bits of color noise within the image.
The display on the Photon is A) much higher resolution than most other phone displays. That means that if you are looking at a relatively low res background image, or you have an app running on your phone that has fairly low res graphics, you will see all the flaws in the image. Also B) the Pentile display supports a greater contrast ratio than most other phone displays, so you will notice subtle changes in color (like an image being a bit pale in some areas) on that display, as opposed to other display types.
What all this means is that if you switch to a phone (or TV or whatever) that has a higher res, you need to get new background images, and look for apps that support the new resolution.