Anki is already being slowly redesigned and is becoming more attractive. The browser sidebar and the editor are examples. There is a big discussion on this thread you may want to look at: Brainstorming for modern UI [Anki 3.0]
Personally, I don’t like Anki Universal’s design nor Metro design in general and find it ugly in some ways.
Bear in mind that Anki is a cross-platform app that needs to work for Mac and Linux users too, and those users may also have their different ideas about what looks attractive.
But anyway, I don’t understand this need of redesigning everything after every Windows release. For me, most effort should be spent on functionality first, especially with an app with limited resources and small development team.