I agree. Never cared much for the UI, and always found it too buggy to keep using. At my old job, we used it for office tunes, and it was often showing the wrong song that was playing, (so you never knew what you were listening to unless you used something like SoundHound), and going to previous or next tracks was inconsistent, so you might not get back to the last song ever again.

Pardon my ignorance but why is Google Play Music not worth mention here?