One more in the "terrible interface" category: The camera. I'm the simplest possible person when it comes to a camera. The only thing I do is to open the camera app, and then press a button to take a picture.
So, on the HTC One, where is the button to take a picture? I have absolutely no idea. I finally figured it out, using an exhaustive process of elimination. I basically pressed every icon (and non-icon) on the screen, and finally was able to discover what took a picture. Then, of course, I forgot it the next time I wanted to take a picture.
In contrast, on the Galaxy Nexus there is no doubt where you press to take a picture. How difficult can these most simple of the basics be? Are there no focus groups?