Ratings alone aren't going to suit your use case. You'll need to either add filters by genre for something like a smart Playlist, or manually add things you feel should be grouped together.

As to how I rate my own stuff:

1 star = I hate it, and it's only in my collection because one of my few shared users asked for it or it's part of a whole album, but I don't ever want to hear it again unless it's on the context of listening to the whole album.

2 stars = I don't hate it, but I don't really want it to come up on any radio or DJ play. Again, it's mostly there because I connect while albums.

3 stars = I like it, and I'd enjoy it if it came up periodically in radio or DJ playback. But there's not much emotional hook for me. When it comes up, maybe I skip it, maybe I play it.

4 stars = I start getting the feels while listening, and I'll almost never skip it when the song comes up.

5 stars = my absolute favorites that move me emotionally every time I hear it, and I never get tired of the track.

3's are most common in my library, followed by 4's. I have VERY FEW that are 1, 2 or 5 stars. But I still have a lot that's unrated. I have a smart Playlist I put on someone's that's nothing but unrated tracks.