Metro
I think metro is very minimal and very clean. But it's also... cold. A bit too austere. The goal for an interface isn't to impress--it's to connect. Somehow, I've never felt a sense of connection with the Metro interfaces. It feels like design borrowed from the annual report of a faceless international corporation. All design; no personality. I like simple and clean. And I like minimalism. But I also think you have to be careful with it or you'll end up with something soulless. That, I think, is what has always subtly bothered me about Metro.