Musicbrainz Picard is a lot easier than beets, although it does require some introductory concepts to make sense (e.g. terminology like “release”, “release group”). And it makes it too easy to accidentally poison datasets in an attempt to be helpful. Harder to automate than beets, too.

Both of them also benefit from a decent knowledge of where your files came from, not as good for a random pile of mp3s.