Just like most of you, I've spent my morning reading the reviews for the Galaxy S4 from numerous tech sites, including this one. Let me make it clear that right now, I own an HTC One; I made the choice to get the One over the S4, but admittedly I haven't had the chance to use an S4 (something I plan to remedy this weekend). My choice to get the One over the S4 was based mostly on the difference between Sense 5 and Touchwiz and LCD vs AMOLED. They're two very important parts of a phone that couldn't be any different between the respective units. Design, however, seems to be the big topic of conversation, and I'm disappointed in a lot of the reviewers who have simply glossed over the positives of the S4 design and centered their pieces around the purely opinion-based notion that the phone is "cheap".
To clarify my point, design is so much more than just the materials used. It's angles, ergonomics, placement, etc. Yes, the Galaxy S4 is made of plastic. Toys are made of plastic. Therefore, this phone must be a toy. It's that kind of ridiculous reviewing that takes away from some impressive feats Samsung achieved on the S4 design. When the iPhone 5 was released, a huge part of their marketing was placed on the fact that they were able to upgrade the internals and make the screen bigger while making the phone thinner and lighter. Samsung has achieved the same thing here; it's screen is larger, the camera/battery/CPU/GPU are bigger and better, and the phone itself is thinner and lighter. The main difference here? The iPhone 5 is made of the oh-so vaunted aluminum and the Galaxy S4 is polycarbonate. Is aluminum a more premium material? Yes. Does that make the S4 design worse for using polycarbonate? No.
Design incorporates actually using the phone and how comfortable of an experience that is holding the phone in your hand. I can say without a doubt, having used an S3 extensively, that the S3 is easily more comfortable to hold than my HTC One. A lot of it has to do with the chamfered edges and the height of the One. It looks amazing, but could be an annoyance for people who like to use their phone with one hand. The Galaxy S3 is easily usable in one hand with a 4.8 inch display. Samsung has made the S4 just as easy to use, but made the screen larger. Had it used an aluminum body instead, this may not be the case.
Design incorporates added functionality. Being able to remove the back cover is added functionality as it gives the user access to the battery/sim card tray/SD card slot. It also allows for users to replace their back cover with accessories or even just another back cover if the old one got scratched/had carrier branding on it that wasn't liked. It also opens the door for wireless charging, a door shut on phones using aluminum like the One.
When I see credible sites like The Verge give the S4 a design score of 5, I really can't make sense of it. We all have our personal preferences, but as a reviewer, it's important to not put personal preference as gospel. It's not for everyone, but no design is. As an HTC One user, I can appreciate the design of the S4. Hope that helps to clear up some ideas about the design for people possibly losing interest in the phone over reviews.