Unless the impressions are ridiculously spot-on, I don't see much of a point. If we can't believe that we're listening to the person being quoted, it comes across as very patronising indeed.

Bobby Pickett! How would you like to do an audio commentary for THE APE? Last chance...
"Hideous Half-Man, Half-Beast Who Terrorized Millions!" - Tagline, WEREWOLF OF LONDON (1935)