If only the UX wasn't god awful shitgarbage. It manages to be underfeatured and obscure and just plain annoying (can I please see all music by the artist?) at the same time. A friend told me that UX designers he used to work with used to mock Spotify and took it as an example for how not to do things.
A private collection and a player like Clementine is so much nicer. It's not like Spotify has everything, anyway. Not even original versions of songs if anyone released an arbitrarily bad remaster.