What is your favorite thing about Windows Phone?

Let's put aside the gloom and doom regarding Microsoft for a bit. If you had to pick a single aspect of Windows Phone 8/7 what would it be? I am torn between the music player and the Metro UI itself. The music player is nice compared to the default iPhone one and lightyears ahead of Android's in terms of interface. The Metro UI on the other hand, has really created the most uniform and visually coherent app market of all the platforms. Everything in the store is basically smooth and well set up because of the guidelines. I also really appreciate the accent color options.

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What is your favorite?