I liked the contrast centered on the doctor this episode.
On one side, there's the Doc's father, who disowned him basically to avoid embarassment and losing his social position. His own son.
Captain Reynolds came back across the system, way the hell out of his way, to get the Doc and River, because the Doc is part of his crew. Kaylee may have been right at the beginning of the episode, that the Doc looked down on them and their life, but not at the end.
In another thread, someone said that they felt Firefly was different from Joss's other shows, Angel and Buffy, which are about heros. I think he's wrong. Mal is a hero. Reluctant, but real.