[stubish]

While I haven't used Pandora (it isn't available here), you seem to be describing my experience with Spotify's various playlists. With no personal context or ranking, the algorithms have nothing to go on except how many other people liked or repeated a song. Other people have awful taste, and seem to love to put songs on high rotation that I find mediocre.

And without decent playlists and music discovery, why would you pay a monthly subscription instead of once-off fees for music you like?