In many ways, the change ruined the UI in many ways to the user in order spite Scott Forstall.
The real question is, has the new UI brought any benefit to the user? - The simple answer is no, and even worse, the new UI has actually negatively benefited the user. Example, why remove iconography in the Notifications panel that described the weather? We as users should not spend additional time reading 2 lines of text to determiner the weather, we should see an icon (like before) plus a High and Low temperature number. Done! Keep is simple Apple, not spiteful.
I think it has enhanced the UI in some ways, but worsened it in others. I agree it was better with the icon.
The multitasking tray, however, is much improved in this version.
Overall I think it's a lot better now.