Darn! My number four is Soap.
Always a bridesmaid, never a bride.
Too bad Wild Kingdom wasn’t a sitcom. We had some fun with that–my father would say Marlin Perkins should be bitten by a snake or gored by a gazelle and then we’d find out if Mutual of Omaha’s insurance plan was any good.
Happy Days was the one we watched religiously in the late 70’s. My parents would tell us “That’s not what the 50’s were like.” But when us kids asked about the 50’s my parents never told us anything.
Fawlty Towers
Porridge
The Fall and Rise of Reginald Perrin
Wow. Nobody ever talks about When Things Were Rotten. An overlooked classic.
Well, sort of.
(I also liked Mel Brooks’s later TV attempt, The Nutt House)
As someone pointed out recently, the 70s are now further distant than the 50s were from the 70s. What’s up with that?
I watched very few of those shows. The '70s was my coming-of-age decade and so I had a lot more interesting things to do than watch TV. The '60s was a good decade for me TV-wise. I was a child and didn’t get out much. By the '80s, I was a staid married woman with children, so the televiewing was a priority again.
Man About the House and Some Mothers Do Ave Em?
The Aunty Jack Show.
I guess most will not have seen them 
I loved When Things Were Rotten! Still trying to find out what happened to Richard Dimitri. He just disappeared after Johnny Dangerously.
The Aunty Jack song. Showing what culture was.
I used to enjoy Fernwood 2 Night, but I guess that’s not really a sitcom – it was a parody of a talk show.
Wow. I knew I didn’t watch much TV in the 70’s, but I’m still surprised that the only one of these shows that I watched was “When Things Were Rotten.”
For the poll I only included shows I watched in their first runs in the 70s.
My appreciation for MASH, All in the Family, Mary Tyler Moore, and Odd Couple came much later in syndication.
I don’t think I’d describe Aunty Jack as a sitcom: if it is, then so is Monty Python’s Flying Circus, and that’s not on the list, despite being originally broadcast (mostly) in the 1970s.