I cooled on it a bit when it showed up on Nick in the 80's. I admit it was a bit cheaper than I remembered it. But now I ask: "Compared to what?" This was not bargain basement animation. If you weren't doing feature animation (and who was in the States who wasn't The Mouse?) then in the USA at least this was what animation was.
What often gets me is how forgiving American audiences are about anime doing the exact same limited-animation tricks that they criticize Filmation for, like static poses with only the mouth and eyes moving, frequent reuse of stock animation, long cutaways to scenery so moving mouths don't have to be animated, etc.
Still, I think it's fair to say that Filmation operated on a somewhat tighter budget than some of its competitors. I see Lou Scheimer as kind of the animation version of Roger Corman -- a low-budget producer who cultivated artists who went on to be greats later on.
One complaint that I had was initially "Too many sequels". And this is actually not true. It's just that the ones that there are are big ones. But Yesteryear isn't as much a sequel to City on the Edge of Forever as much as it "just" uses the Guardian.
It's arguably more of a "Journey to Babel" prequel than a "City" sequel.
And More Tribbles is nothing like The Trouble with Tribbles other than the tribbles are still the MacGuffin and it has Cyrano Jones in a far more passive role than the last time.
Funny, I'd say it's far too much like "The Trouble with Tribbles." The setup is exactly the same, the
Enterprise encountering Koloth, Jones, and tribbles while escorting a triticale variant to Sherman's Planet, which is preposterously coincidental. As I mentioned, I prefer a sequel like "Once Upon a Planet," which doesn't just rehash the original setup but tells a markedly different story that expands meaningfully on the original.
As for "It's Star Trek for kiddies": Is it? There is the "The crew gets SMALL!" which has a kind of kid's show feel. But it's certainly not the first sci-fi to tackle such an idea.
There's no equivalence between silliness and childishness. There's tons of nonsense in supposedly "adult" sci-fi, and some of the smartest shows I've ever seen are kids' shows.
Besides, TOS had Flint shrink the entire
Enterprise into a tabletop model, and DS9 did "One Little Ship." And plenty of other stories have done miniaturization --
The Incredible Shrinking Man, Fantastic Voyage, Land of the Giants, etc. The motivation isn't to aim at children specifically, but to explore an interesting visual and a distinctive adventure dynamic.