So many geeks, so little time.
Just kidding. More views of data would probably be good.
Dates in our YADB database are probably not very accurate. Allowing users to correct data is a wonderful and, at the same time, scary thought.
I'd like to hook a wiki for metadata, but that's a big project with uncertain payback.
I think a lot of it comes down to the problem of consensus on standards for things like this... what is "date"? Is is the year the track was originally released? The year the album was released? What about compilations? Should all tracks have the same date, even though many were written decades before?
And what about classical? Date composed, date recorded, album release date etc etc
The same goes for other fields (Artist vs Composer, Performer, Featuring, Band, Conductor, Lyricist etc etc)
Until we have separate fields by default for all these things, and until YADB supports submission of each of these separately, there will continue to be inaccuracies, as you mention, because people will have their own definitions for fields like "Artist" and "Date".
I'm not sure about a solution... I like wiki's... I've never submitted content to one though. Does the MC community have enough of a user base to support setting up the infrastructure for something like this?