I didn't watch the series when it originally ran because I was busy doing something else when it aired.  But, man, I got so tired of being around people who didn't want to talk about anything but Firefly.  I got around to watching the entire series when it came out on DVD, and while I enjoyed it, I couldn't figure out why it resonated with so many of my friends.  I mean to the point where it seriously changed their social lives and one of them even got a Firefly tattoo.  I thought it was a good show but it just didn't have that big of an impact on me.