I'd like to clarify that the editor identified by the handle "SE", is not me.
About Serenity:
On the whole I was disappointed. I went in with high expectations, which probably exacerbated my disappointment. It was a decent piece of sci-fi. The acting was great, the story only a little unfocused. But it was too much an extended sitcom and too little a bigger, tighter, more serious work.
I don't think entire scenes were designed to support witty banter. I do think entire scenes were wrecked by it. Joss did a very good job of building up emotional tension. Unfortunately, he'd immediately dissipate it all, uselessly, with overly cute and witty sitcomesque dialogue. Many of the scenes he built up were worth far more than he got out of them by "going for the laugh."
Oh well. We've had the two ends of the spectrum now. Episode III, which took itself far too seriously, and Serenity, which didn't take itself seriously enough. Maybe someone will start striking a good balance soon.
And finally, I'm disappointed by the "naughty bits" that were thrown in. I'll not be letting my kids see the film until I'm comfortable explaining to them what Kaylee could possibly mean by battery operated widgets in her nether regions. And therefore won't be buying the DVD anytime soon. What a sad, forced, little bit of cheapness to have been thrown in.