Rent it, Netflix it or watch it on hulu.com. That way, if don't care for it, you're not out any money.
I like BSG, but just mildly, and I really liked DS9, but I never was a huge Buffy fan and only watched the last season of Angel. But I liked Firefly. It took a few episodes to really get me hooked, but by the time I saw "Objects in Space," I was addicted.
It's only one season, so I say give it a try.