I never read any of the books, didn't actually know they were originally a book. I grew up with the TV show though. Hated it. I've never watched TV or film for the feels. Tv and film for me is escapism, I don't want to be depressed or have to think. I'm assuming this is why I never liked the moomins.
Tove wrote them as escapist escape:
(FTA)
The Moomin stories were born, Jansson wrote to her friend Eva, “when I was feeling sad and scared of bombs and wanted to get away from gloomy thoughts… I would creep into an unbelievable world where everything was natural and friendly – and possible.”
There are actually six different TV series:
1959: https://en.wikipedia.org/wiki/Die_Muminfamilie
1969: https://en.wikipedia.org/wiki/Moomin_(1969_TV_series)
1972: https://en.wikipedia.org/wiki/New_Moomin
1977: https://en.wikipedia.org/wiki/The_Moomins_(TV_series)
1990: https://en.wikipedia.org/wiki/Moomin_(1990_TV_series)
2019: https://en.wikipedia.org/wiki/Moominvalley_(TV_series)
I highly recommend the 1990 Polish stop motion TV series https://en.wikipedia.org/wiki/The_Moomins_(TV_series). The only one that, to me, captures the magic of the books.