I had the opposite problem on some genres and some that werent full enough. Guess thats more down to the size of 'your' library and how 'you' organise your tracks.
This is what's so good about the update. It opens up lots of options for viewing your tracks.
What I did was divide my music into 3 main type.
1.album CDs
2.compilation CDs
3.other
Then for albums - c:\jbp\Genre\Album Artist\Album\tracks.mp3
For compilations - c:\jbp\Genre\Various Artists\Album\tracks.mp3
Then singles and other odd ripped files go - c:\jbp\Genre\Artist\Other\tracks.mp3
I also have the special categories like "my favourite tracks" and "Top Artist" in each Genre.
So my hip hop looks like this.
Link
http://db.tt/GsrSlpB1