Rotten in the role of the good-looking baddie? (6,5)

I believe the answer is:

pretty awful

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'rotten in the role of' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'good-looking baddie?' is the wordplay.
'good looking' becomes 'pretty'.
'baddie?' becomes 'awful' (I am not sure about this - if you are sure you should believe this answer much more).
'pretty'+'awful'='PRETTY AWFUL'

'the' is the link.

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