I like parts of it but wish it had a few more sensechecks in whatever algorithm it's using.
There are times where if you've bought a 'Greatest Hits' album, it just offers you lots of other Greatest Hits or all the other albums by that artist. At which point, you don't want to say 'Already Own' since you don't. And you don't want to say 'Don't Like' since you might want similar artists.