I think "cameos," especially big name ones are what is holding back modern rap albums as art pieces. It even made me a little uneasy on Game Theory, but when it was in the hooks I didn't mind as much, and I understand when using em to show a pal or protege some publicity. But it definitely breaks the flow of a great rap album to hear new voices on each or even some tracks. then It's just a mixtape. It even butches the beauty of the jacket art to see half the song titles be followed by a set of parentheses.