I miss GPM's UI. While I'm a pretty firm YTM customer (price, features, catalog, artist payout feelgoods), the UI is pure trash and annoys the hell out of me. From playlists, queues, browsing, and recommendations, it's all awful.

Thankfully music is mostly "search for that song", "play a mix from this playlist", or "play just this playlist" so no one needs to suffer through it for long.