Russell Crowe as Jack Aubrey?

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My wife is a devoted reader of Patrick O'Brien's Aubrey/Maturin series, and was quite disappointed to hear that Russell Crowe (who she likes) was cast as Jack Aubrey. He's too serious, and doesn't look right. Alternate casting suggestions, anyone?

(I have to say, as a "casting call" tangent, that James Cromwell would have been PERFECT as Dumbledore from Harry Potter, and I was quite disappointed when I heard Richard Harris had been cast. He's not spry enough.)