The music video isn't much, and the lyrics aren't especially deep or powerful, but the song is catchy as hell. I love the country/bluegrass feel and can't help but dance along when it's on.
The thing that I love about Mumford & Sons is their twangy, folky sound. It's like... country for people who are too cool to be caught listening to country. If I didn't know better, I would have sworn that they were from the American south.