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So feature-less it's almost useless.
It works, but it's so limited that it's useless (just like XBox Video). Microsoft should make a single clean universal media player that's straightforward, but includes features more advanced than this piece of junk: playlists, star ratings (with half-stars!), subtitle support for videos, lyric support for music, ...
Something everyone would be happy to use!
Pros: It does play music files
Cons: It needs to read more formats (including video)
It's very slow at finding music in the library
It doesn't support star ratings!
It crashes once in a while