Screen - The new aspect ratio is currently not supported by most applications. Any FBontakte will be quickly ated, and with games it will be sad. In addition, when watching a video, part of the screen is still not involved. Absolutely stupid rounding in the corners. Annoyingly too sharp automatic brightness control, it constantly throws the brightness either high or low.
Camera - the phone has last year's sensor, which was not very good even then. Image processing algorithms very aggressively remove noise, while the picture is smeared. Especially noticeable in the photo inside the premises. The camera in the year before last nexus 5x was better, it retained a lot more fine details (but was slower). In addition, HDR does not work well, when you try to take a picture of the sky, something constantly overexposes.
Performance - everything is ok, but the phone itself for some reason clogs 3 out of 4 GB of RAM with rubbish. But this does not affect the speed, and thanks for that.
Battery - a miracle did not happen, and the phone does not live for two days.
Design + ergonomics + safety - a lot of complaints. The fingerprint scanner is EXTREMELY unsuccessful. Not only is it next to the camera, but it is also small, so when using it in a case, you have to push your finger into its hole. Another problem is the "frameless" design, which consists of glass and metal and without a case will quickly break. Therefore, we immediately put on a cover-overlay. And in the case, the dimensions of the frames are already approaching traditional smartphones. The round edges of the screen and the back panel make it difficult to take the phone off the table (again, this is solved with a slip case).
Sound - no stereo sound (which was in the nexus 6p, for example). Not that it is very necessary, but it is nice when the speakers are pointed at the user.
Soft - unremovable trash on the phone is in quantity, some of it cannot even be turned off. Plus a completely unnecessary Bixby. Samsung also has a tradition (I watched it on the s7 edge) to make the system buttons small - you don’t always hit it with your finger the first time.