Our family cancelled Apple Music after trying valiantly to live with it since it was first released.
Ultimately? The service just stinks, all the way around.
The Music Match functionality seems to be the biggest thorn in our collective sides. My wife and I both own desktop Macs with extensive music collections housed on them. Mine has a MP3 "rip" of pretty much every track off every music CD I ever owned since I was in college, plus all sorts of content obtained online over the years.
Hers is the same way, except a fairly different mix of music collected up over the years. (I used to listen more to heavy metal and hard rock, while she was really into all of the British "new wave" type bands. Both of us have plenty of "classic rock" too -- but her collection tends to trend back a little further in time than mine. And where I'd have the occasional rap album, she tends to have the occasional country music album.)
For both of us, turning on Apple Music caused it to wreck our personal collections. Music Match would keep trying to replace albums we had with "high quality AAC" substitutes, only to incorrectly substitute things. Albums we owned with "bonus" tracks on the end might wind up replaced with one without them, or a rare import was improperly matched with something different. Cover album art got all mixed up too. And often, there would be an album where Apple Music apparently only had SOME of the songs from it -- so it would just delete the rest of them that we owned initially.
Thanks to Time Machine backups, I think both of us got our original collections restored again... but it was impossible to really get the intended experience, where all of our devices allowed access to our full libraries. (I think in my wife's case, she owned more tracks than Music Match even supports for matching.)
In my case? I just turned off Apple Music on my Mac that holds my "master collection", and let Apple Music work only with my iPhone. That wasn't too bad - because then I could download anything I felt like listening to and use it on the go with my bluetooth headset. BUT, because my commute takes me on a train through areas with no cellular data service? It constantly screwed with Apple Music playback. (Apparently, even if you downloaded a track to listen to offline, it needs to talk with an Apple server before playing it, to verify you still "own" it. If service drops out, it just hangs or times out and won't play a song ... or a song in progress stops playing and has to be restarted where it left off.)
Apple Music can go fly a kite if it is going to keep turning my phone into an advertisement.
I've disabled "show Apple Music" in settings three times this week only to have it reenable on its own every time. If I wanted a horrible user experience and to be the product, I would switch to Android.