All of the core Apple apps such as Phone, Mail, Reminders, Safari, Music, etc., look absolutely horrible! They feature anemic white backgrounds with small, difficult to read gray text in many cases. And the minimalist button icons in these apps are small, and look like my 4 year old designed them. I wear reading glasses with a diopter of 1.50, and it's actually difficult to use the interface. I feel like I need a magnifying glass! I had no such problem with iOS 6 on my iPhone 4s. I was considering purchasing an iPhone 5s, but iOS 7 really is a setback in usability.