But I don't use music streaming services at all -- I run my own media server and stream from that. So what I started doing years ago is to ignore any existing metadata (even song and album titles) and enter it all myself. I've developed a system that meets my needs.
But it also means that every time I buy a new album, I'll be spending 15 minutes or so entering all the metadata for it. That sucks. I'd really prefer it if the online music databases got their act together and tagged everything at least in a consistent manner.
None of the fields in the databases can be trusted completely, but the worst offender of all is "Genre" and similar.