Well, it's not a ha-ha comedy, but there's a lot of dry humor mixed up with the drama. It's very original--there just isn't anything else like it, as far as I know. I loved it, and became totally hooked, and I'm not somebody who even watches much TV. I would suggest watching all the (13?) episodes, unless you really, really don't like it. Then watch the movie "Serenity" for completion. That mix of outer space, the wild west, and Chinese/English is pretty strange, until you understand the history of why things developed that way in the Firefly universe. I always find it a little difficult to "get into" a new science-fiction universe…I loved the Star Trek universe so much that it was hard at first to get into the Babylon 5 stories. Once I did get hooked on Bab 5, there was no stopping me. It was the same with Firefly…you have to tune in your brain, and give the new reality a chance.
If you like Nathan Filion and you're looking for comedy, I'd recommend the first two seasons of "Castle." Great stuff.