Re: Do you think I'd like Firefly?
If it were close to any of those shows I'd probably say Farscape. There's a healthy dose of humour, and both revolve around a rag-tag crew who've just fallen in together.
As far as the writing goes, it's probably better to say whether or not you like Buffy and/or Angel.
I am a Ranger. We walk in the dark places no others will enter. We stand on the bridge and no one may pass. We live for the One, we die for the One.