After reading through this PAINFUL thread, I feel the need to chime in about a number of issues here. As a disclaimer, I do not review phones for a living, though as a part of what I do for a living, I do help my customers with phone related issues, and have more than a passing knowledge about them.
So, build quality. The HTC One vs. the S4. The One has a smaller screen, and as a result, even with the higher PPI, it still uses LCD, so may very well be cheaper to manufacture. The One also has Gorilla Glass 2, not 3, so the glass is smaller, and cheaper. The One has some other costs due to more expensive materials, but the S4 has the advantage when it comes to some other components. It is all a tradeoff, but if you tend to drop your phone on a regular basis, you WILL have your phone in a case, and if you are paranoid about dropping a $650 phone(off contract price), then you will be more careful, and build materials and such won't be that big of an issue, because you should know yourself, and how careful you need to be, or you get proper protection. How it feels in the hand is one of those things that is subjective, but my Galaxy S3 without a case is comfortable for me to hold and use, and a thicker device, or one made out of different materials won't matter when it comes to using the device.
Now, there MAY be some issues people have had as far as QUALITY, and problems COULD introduce performance issues, meaning if you are encountering stuttering, don't assume it is by design right now because it MAY be a manufacturing defect. Everyone assumes that their brand new device MUST be perfect, but when there are so few device owners around that have received their phones, don't assume your experience represents what others are encountering. Some S3 owners have run into issues that no one else did, and some performance issues show up from select apps that get installed that may cause issues. I am not saying the S4 by design may not have problems, but on the flip side, don't go on your own problems and assume everyone has them. It is like the iPhone 4 antenna issue that not everyone encountered, and other situations where SOME units had problems and others did not. So, I simply suggest you try getting a replacement before assuming any pausing issues reflect the design, and for now, treat it like a defective unit that you should get replaced.
The whole on-screen/off screen for buttons is a messy subject. I personally HATE the on-screen menu bar, and the fact that it shows up in screen shots is a horrible concept. Don't reduce SCREEN space for a software menu bar, and Samsung is right for NOT wanting that, since it actually makes the experience of using the device WORSE. Google should have gone with the idea of a dedicated gesture area the way Palm went with the webOS phones, and that eliminates physical buttons, and would allow manufacturers to define certain things about the gesture area that could be different, without breaking overall device use or compatibility. Google will HOPEFULLY address this at Google I/O, and with any luck, the issue will be laid to rest in a few weeks for future devices at least.
And finally, the whole moderator "thing". Moderators have a difficult job of having to police the forums, and deal with troublemakers, calm frayed nerves, and hopefully keep the peace. It isn't easy, that's for sure. On a LARGE site like this one, where you have people who are passionate about their preferred devices and manufacturers, things CAN get a bit messy. So, moderators try to step in, and their own personal preferences come out. You know what though, they ARE people, and WILL make some mistakes. Accept the fact, treat them with respect for doing a JOB that you probably would hate doing after a few weeks, and then POLITELY steer the discussion in a positive direction. No one enjoys these stressful discussions, so when you see them spiraling out of control, try to help the moderators by not feeding trolls.
And yes, I can be a bit of a know-it-all *** from time to time(or more often than that), but I've been around the 'net for a LONG time, have done most types of admin work at some point, so know where a lot of people are coming from. We all have our opinions, and want them heard, yet should ALWAYS understand that others have the same rights and desires.