Yes, it's a good movie. It's main theme is similar to Mel Gibson's The Patriot (I should write more chronologically that The Patriot bears some resemblance to the Shenandoah), as it shows a head of family who tries not to get involved in the Civil War, which he believes is not his business. Yet, circumstances force him to get involved.
And the movie itself seems to be quite "uninvolved" in politics, it doesn't state which side of the conflict was right. It concentrates on the internal conflicts of the main character.