I don't know how relevant a single review like this is. Screen size is very much a personal choice. What really matters is do MOST people want a bigger or smaller screen on a phone. Not sure what the answer to that is, but iPhone sales are hardly struggling.
Personally, I really like the big screen on a phone, it's a pleasure to use (some of my friends have large samsung phones), BUT if I were going to buy my own phone, I would probably still get the smaller screen. Because as much as I enjoy using a big screen, I would not want to carry a giant phone with me everywhere. The advantages of a big screen are outweighed by the advantages of portability. But, that's just me. I wouldn't mind a small size increase, maybe, at least to make it easier to press small things on the screen, but for me, a really big phone would be annoying in terms of fitting in my pockets and whatnot. I don't know how the majority of smartphone users would feel about that, however, but it seems that most people do prefer smaller phones, in general.