One thing that struck, first from previewing some folks' reactions on here, and then by seeing it myself, is that the commitment all the performers and crew made to doing this for real made all the difference.
Mild rant, but: I was a marching band kid growing up. In fact, I rejected doing theater stuff in favor of band. That activity, at high levels, is actually very difficult, similar perhaps to other performing arts --- like musical theatre, dance, etc. I was okay-enough at this that I was selected to join a
drum and bugle corps, sort of like a select team in youth sports. These groups, mostly college students and some high schoolers (which I was at the time), work their asses off, practicing outside all summer, 10-12 hours a day, sleeping on high school gym floors and acting as our own roadies on a two-month tour, which competitions every few days later in the season.
It was great fun, and a big learning experience, and not dissimilar to the "competent people pulling together to achieve things" theme of Star Trek and this episode in particular. Any one who has done any performing with a group knows how gratifying that feeling can be.
Anyway, one big thing I took back to my high school marching band: Yes, it's all a little corny. But when everyone commits fully, the impressiveness of the product can't be denied, even if it's not something the audience really is interested in.
Over the years, I've taken several people with no background in music or marching to these drum corps shows, and they always enjoy it. Seems similar to the effect of a good musical. Still niche, but executed well, is impressive.
This was not a perfect musical, but a good one, AND it did good things TV-show-story-wise, AND everyone sold it. Made it fun and worthwhile. A minor creative triumph for this show, and I really love them for it. Also, to do all this production on a TV is wild. Really huge lift.
And, as a random recommendation: If you like marching bands or anything like that, go check out some DCI drum corps videos on YouTube. Some even wear GoPros, so you can see just how challenging and intricate (and fun and exciting) the activity can be.