No, but aesthetically that's the initial attraction, is it not? That's what draws somebody in to a device based on how it conforms to their hand, color, design and it's overall appeal to the user. Over time, that euphoria will wear off and ultimately comes down to the experience one achieves from actually using the phone. But then again, Some never use cases and the phone is aesthetically pleasing to them from the first day It was purchased. And I'm taking into account that all experiences will vary.
If it's your first iPhone of course. If you are upgrading and are in the iPhone cycle then I don't think the looks really matter. The brand is strong and it's a cool device to own in its own right. My next phone will be an iPhone and I know that before I see what it looks like.