I know it's easy for me to be an armchair quarterback but I have to say it. Although I am currently and somewhat reluctantly paying for it (for now), Spotify's UI makes me want to strangle someone every time I use it. I can never remember exactly what ridiculous combination of screens I need to cycle through in order to get where I want to go. It feels like I'm trying to enter a fucking launch code for a nuclear submarine just to play a damn song. God forbid I'm running and hit the wrong screen, then I have to stop, fiddle for 3 minutes, and start again.

Also the stations are incredibly shallow. If you pick a station on Pandora, you will have 100+ songs that are generally well selected in my experience. If you pick one on Spotify, you get maybe 20-30 songs.

The one major benefit to Spotify is that you can pick any song you want, you're not forced into stations. However, if you pick a genre, you're likely to be inundated with shitty cover bands that you have to painfully sift through in order to find the actual playlist your looking for, because '70's hits' could be anything from Led Zepplin to your next door neighbours cover band.

TLDR - incredibly over complicated UI, shallow stations, too much spam music.