I watched this episode when it was first broadcast. For me, going into it knowing that it was to be the final episode made it an emotionally-laden ride in ways that none of the other episodes ever were. I suspect that other MSTies may have had similar reactions and that some of the dissatisfaction with the finale may stem from these issues rather than from the comedy itself.

I do think that Diabolik was a much more challenging film to riff than most of what the Brains tackled during the Sci Fi era, and I support them going out on a high note in that sense. That said, I personally think that in general the 10th season was not their strongest.