Yes, I'm a fan. I've read the whole series at least three times and some of the books more often than that. I have a few favs on audio as well. Don't forget the Golden Ocean and the Unknown Shore which are not part of the series but equally good. O'Brian is the best writer about the navel sailing warships I know. But I'd read him even without the sea element. The Aubry Maturin series is really one very long complex novel about the friendship between two very different men.
If there is a god, I want to believe that there is a god. If there is not a god, I want to believe that there is no god.