Don't call it Metro, just call it Good Design
Am I saying everything should be "flat"? Oh jeez I hate that term. If you ever hire a designer, developer or read an article with the words Flat Design in their title, just runaway, run to the mountains, because that person doesn't understand that this isn't about being flat, it's not a style... Styles come and go, like fashion styles... They are hot now, they are dead in two years. The thing Microsoft and now Apple (thank you Ive), and a huge number of UX and UI design agencies are trying to do is to apply the design principles of Modernism. Modernism, you know? The philosophical, fine arts, architecture, cinematographic movement that started in the early 20th century. Bauhaus, Swiss design, International style, Helvetica and geniuses like Massimo Vignelli, Walter Gropius, Mies Van der Rohe, Richard Meier, Dieter Rams, Luis Barragan, Stanley Kubrick and even Jonathan Ive from Apple are just some of the lighthouses and masterminds that spent a century exploring the same things that today's designers are exploring. How to convey stories, and enable user experiences. We simply happen to have a different medium, it's not oil or acrylic, nor brick and mortar, but pixels. Those tiny little sparks of light that we as designers carefully arrange and order. That's our medium, plus the input mechanisms which these days we have plenty. So when someone says 'flat' then the conversation automatically degrades to talking about styles or fashions instead of a timeless movement like Modernism. Read more about the guys I mentioned above, read more about Modernism, the movement, not the style.