RIP iPhone. I liked the back of the other iPhones, like the iPhone 4, with some sort of glass plate at the back. Now not only iOS is all flat and without the shininess everywhere, but the iPhone becomes all matte as well. That rear plate is terrible, it looks like a cheap plastic toy. This isn't an iPhone anymore, it's a Samsung with Android. Basically, everything that made the iPhone unique is gone. And then they tell you "Oh no it's the same, we just changed this and this but iPhone users will still feel at home [because there's still this, this, and that]" But "this, this, and that" are found on every phone, if you get my point. So the small changes they made are exactly what made an iPhone an iPhone.
And when you take a closer look at the people who praise it so much, it's either people with extremely low self esteem who love and do everything Apple says (the modern slave), or former Samsung/Android users. Well, yes, if I gave you a Banana cake and you didn't like Bananas, and therefore removed all the Bananas and suddenly loved the cake, you can't really say you love the Banana Cake. You love cake. So go buy cake in the first place, not Banana cake.
Apple needs both these types of customers, the low self-esteem geek is a strong support who is like a dog who follows you all the time and has nothing really better to do while the other people are customers "stolen" from other companies, with basically everything the other companies stood for. Weak, Apple…

And the round corners are not nice either. I don't know anyone who prefers the look of the iPhone 3G(S) than the one of the iPhone 4-5S. But that is subjective.
Edit: Oh god, when I read comments like:
Get your head examined. The iPhone 4S is so old Jesus used it to talk to God.
The 4S is not a bad phone, and unless you have little hobbies in life it will suffice. That's exactly the problem of this whole thing, people are so materialistic and want to get all the latest things, instead of a good product on long term. And it's not intellectuals or free-spirited people who think this way, it's the working class. People from the working class, wether they have become wealthier already or not, always need to define themselves with materialistic things, because they have nothing else to give. Apple used to be for normal people, now it's for chavs. If the 4S is so old Jesus used it, I'm wondering how old you are … perhaps we should consider replacing you …