I think we should put a lot more emphasis on rating and displaying data quality. Maybe an additional top category “very high quality” (or whatever) would be good, which means that really everything is there one could dream of (complete high quality cover art, discid, etc.)
I like the way discogs indicates the state of a release by a vertical colored stripe left of the release title. We could go with gold (very high) - silver (high) - brown (normal) - red (low) for example. That could motivate people to bring the releases in their personal collection up in quality, simply because it is a visual satisfaction to see all the nice colors there. A bit of gamification, but with an emphasis on quality (not quantity)!