I don't watch much television, but it's not because I hate tv, it's probably more that I could sit and watch it for hours. However, there are some shows, such as Lost, that I watch and spend time looking at. It probably has to do with good writing. Battlestar Galactica has writing that appeals to me.
I was old enough to watch Battlestar Galactica, the first series, as a 10 year old fan of Star Wars. It failed to grab my attention. When the second series came out, 4 years ago, I was not interested, until some fairly interesting and intelligent people I know started saying "you have to watch this." And so I did, and now I'm a junkie. It's got a monotheism/polytheism angle, and a Christian/Jewish angle, and issues surrounding identity and sin and predestination and on and on.
Here's some great talks on the show, which are good to watch even if you haven't yet gotten into the show (and there's only a half season left, so I encourage you to get into it.) The links come courtesy of Galactica Sitrep, which is the best Galactica blog out there.