By: Addison Wylie By playing the role of Bianca ‘The DUFF’ Piper, actress Mae Whitman finds herself in the midst of being typecast.  She plays this precocious misfit so well, that I can already envision casting agents salivating.  The predicament Whitman and those eager agents find themselves in is that The DUFF isn’t a great movie nor particularly memorable.  Its resonating buzz will be made up of satisfactory shoulder shrugs and head bobs from those…