So someone thinks of a whole load of incidents and scenes and images - not many of them very innovative, some of them seriously old - and then comes up with just enough plot to hold them together. It's a plot dependent on too many coincidences, naturally, but the point is to cram all those bits into an hour, not to tell a decent story, after all. Not actually the worst hour I've ever spent, I suppose, but hardly enough to sustain any mystique.
(Okay, the "guns that work!" line induced a smile. Only a very small one, though. Oh, and I now have to go with Andrew Rilstone's ideas about some characters representing the show's own fans and their foibles, which haven't always convinced me in the past; here, the metaphor just got painful.)