One thing which would be useful is to know other people’s ideas on hwat the star ratings mean to them.

For me it works like this:

1 - poor - delete without any thought 2 - ok - delete if space required 3 - good 4 - very good - always happy to hear 5 - the very best

That way I know if I have a playlist with more than three stars I’ll always hear stuff I really like. Most of my songs are 3 stars, I do have playslist where I include 3 star songs and I find myself moving them to 2 or 4 star ratings as I hear them more.

I have similar ideas for iPhoto / Aperture ratings:

1 - delete - bad quality / out of focus 2 - delete if space needed - fix able but not very good 3 - good should keep 4 - very good and should print 5 - the very best definitely print and show to people!!