Not great by any means, the girls ain't even too hot, but there are far worse shows in the history of TV sitcoms.
A few come to mind
Small wonder with that little girl that pretends to be a robot, absolutely awful !
My mother the car, pretty damn bad
Many more exist but those two come to mind
Tons of shows only last a few episodes and get cancelled before they are even noticed.
I would call all in the family one of the best ever, really like Carrol O'Connor, Edith got tired of her role and quit after many seasons, Archie continued with AB's place, which was just okay . There was another spinoff called Gloria that totally failed and lasted maybe 10 episodes, rarely seen, even on C type of garbage channels, they went too far with that one.
Some excellent spinoffs of family exist in particular the Jefferson's, Maude was decent to.