She has a good understanding of entertainment and performance. Her presence will change the focus of the show somewhat from a purely musical competition to one with perhaps a bit more showmanship and performance skills.
American Idol has been on the air for years and could use a little shaking up. Plus, she's funny and well liked by a lot of people (even if she's not a favorite to some FReepers ;0)
IMHO her presence will improve the program which is getting into a rut.
As Simon Cowell always says, "It is a singing competition." Degenerate knows nothing about singing.