Good: The scenes where they vented the fire into space made if very obvious that there is no sound in vacuum.
Bad: The voiceover intro has gone from colonizing a new “solar system” after the Earth gets used up to colonizing a new “galaxy”. (I believe this episode may have been filmed earlier, so they may actually have changed from “galaxy” to “solar system” rather than the other way around.) This betrays a common sci-fi confusion of scale. “Interplanetary”, “interstellar”, and “intergalactic” are not synonymous, despite what some blurb writers may think. As far as it goes, the most likely location for the newly colonized worlds would be in a number of nearby solar systems. It seems unlikely that all those habitable worlds (or even terraformable worlds) would be in one system; but it also seems a bit grandiose we’d go straight from a ruined Earth to a whole new galaxy. Mainly, though, they ought to settle on one scale and stick to it.
Good: We can see why Mal’s the captain. He gets very focused in a crisis.
Bad: When a spaceship’s engines break down, it doesn’t just stop. It’s certainly possible an internal malfunction could cripple life support, in which case the ship would arrive at its destination with the crew dead. (It would likely also keep on going right past its destination unless the navigational computers were automatically programed to retrofire or fire maneuvering thrusters in order to put it in orbit around its destination.) They seemed to be saying Serenity had just stopped dead in space.
Possible workaround: I don’t know exactly what that spinning engine does. It might be some sort of “space drive”, which operates by somehow distorting space-time in front of the ship–a “warp drive”. Maybe or maybe not possible, but certainly plausible enough even for “real” science fiction, let alone a TV show. If so, I think that if such a drive stopped working, the ship might actually just stop moving, since it was never actually moving relative to space itself, if you see what I mean. However, in a lot of the exterior shots, the ship seems to be using some kind of reaction drive, which implies ballistic trajectories again.
Good: The ship was crippled by an internal malfunction. In Star Trek (all incarnations), ships are invariably menaced by spatio-temporal anomalies and similar technobabble. In real life so far, just about every known loss or near-loss of a spacecraft (manned or unmanned) has been the result of an internal mechanical malfunction, with the odd collision (Mir), and one screwed-up re-entry trajectory as the result of human error–not converting from English and metric measurements (Mars Climate Orbiter).
Good: I like the assorted backstory(ies) and the characterization it gave us.
I suppose some people might find the multiple time-frames and flashbacks confusing. Personally, I like that kind of thing.
I really hope they don’t cancel this show.