I think we can all agree that a show about a group of gay sci-fi fans is a fairly niche product, even in an era where The Big Bang Theory is a significant hit. I also think, even given its niche nature, that it's a reasonably good idea for a television show. Identity, these days, comes not just from race and church and sex and nation. We define ourselves based on our politics, our interests, our places of education, our groups of friends, our sports teams.
What's interesting is less any individual thing we choose to define us, and how the disparate pieces of our identities come together and clash. It's fascinating that we live in a world where it may be more socially acceptable to be gay than to be a very serious and committed fan of science fiction, that fantasy sports can be the basis for an entire social network. Exploring affinities and how they affect our lives, friendships, marriages, and families is important work for understanding the power of our popular culture, and for understanding ourselves.