My favorite Tv show is definitely Firefly. I love the story, the world, and the characters.
I think the reason I like it so much is because of how different it is from most Science Fiction. Its gritty and tough, and not polished and fancy. It seems far more real and that is really cool.
Also there is a character for everyone, no matter who you are there is someone on the show that you will like and identify at least a little with (I am personally a Kaylee fan)