I'm sure someone else can put it into better words but ios7 looks rounded, bubbly like a kid drawing in balloon writing. iOS 6 feels like straight lines, professional, more adult. The colors looks more baby like too (bright? pastel?) compared to the more pro iOS 6 colours.
Features aside, I feel like the ios team chose the design from a kindergarten competition
Features aside, I feel like the ios team chose the design from a kindergarten competition