I finished watching it today, but that's no huge feat considering only 14 episodes were made.
Anyway, this series really just reinforced what I already knew:
Joss Whedon is a fucking genius, and television studios are run by a bunch of gorram [insert Chinese "swearing"].
Still, the good news is that the film, Serenity, is coming out towards the end of the year.
Anyway, say what you like about Quentin Tarantino or Kevin Smith, nobody writes dialogue like Joss Whedon.