I don't think it's odd you like the radio series more. Most of Brooks' stories were built on misunderstandings -- Three's Company, but with better grammar. And it's much easier to suspend disbelief for these heightened, silly scenarios without the limitation of visuals.
However, I don't think...
Which one(s) did you watch? There's a big difference in quality between a 1953 episode and a 1955 episode.
I think the first season is great and each year thereafter is a continued descent.
But don't forget, by the time the show moved to TV, they'd been doing it for four years on radio and...
Listings are up on Amazon for Our Miss Brooks. The runtimes -- 850 minutes is both volumes' combined -- suggest that either all 38 episodes from Season One won't be included (there's one from the first year that's excluded from the syndication package) or that they're all edited, about 22:30.