There was a thread a few weeks ago talking about how well "Master and Commander" would portray the characters of Aubrey and Maturin. Ebert addresses it to some extent in his review:
http://www.chicagosuntimes.com/output/ebert1/wkp-news-master14f.html
http://www.chicagosuntimes.com/output/ebert1/wkp-news-master14f.html