I can’t speak for everyone, but for me, it just works. I’ve never had any of the issues people are mentioning in this thread. The app isn’t slow or buggy for me, I’ve never had artists I listen to disappear from my playlists, and I can find pretty much every song I want to listen to. Most people I know use Spotify too, so sharing stuff is just a little more convenient.
Other people no doubt have legitimate complaints, but using Spotify is barely registering as a problem compared to other applications I have to deal with.