One thing that TMP does really, really well is give you a good idea of the relative scale of the ships. We see Kirk and Scotty step into a shuttle that's just big enough for the two of them, maybe roughly the size of a car. Then when we see that shuttle in comparison to the refit Enterprise, we really get a sense of the immense size of the ship & have its details drilled into our heads in preparation for the rest of the film. And then, once the Enterprise enters V'Ger in the second half of the movie, we can see how utterly dwarfed it is by V'Ger, where it's just a little speck within its maw. I have my problems with TMP, but that was just brilliantly done.The problem with TMP today is partly of context. In 1979 fans were really hungry for new live-action Star Trek after an absence of ten years. Showing off the refit Enterprise was a love letter to the ship. If you ever get the chance you have got to see that sequence in an IMAX cinema—the Enterprise looks thunderously huge! It is mindblowing! Not even the 1701D ever conveyed that sense of size even in the TNG films.
So by that logic, "The Menagerie" must take place in a different reality than "The Cage", and The Search for Spock and The Voyage Home must take both place in a different reality than Star Trek II: The Wrath of Khan because they recast the significant roles of Pike and Saavik with other actors.To be honest if we have to have a Mudd, then I prefer the original! Having another actor play such a significant role proves to me that the entire series is another reality!
"Magic to Make the Sanest Man Go Mad" is far and away my favorite episode of DSC's first season. That was great.While I’m not exactly Discovery’s number one fan, I thought Rainn Wilson did a nice job with the character.
The afterlife ain't cheap, man.Laurence Olivier was cast in Sky Captain and the World of Tomorrow long after his death. And he took the job.

To answer the original question, I like "Miri" at lot in the teaser and the early scenes of exploring the duplicate Earth. But as soon as we get into the disease and the stuff about the "Onlies" and the "Grups", my interest dips considerably. And I second the thoughts about "Spock's Brain", which starts out strongly enough but gets increasingly dumb as it goes on.