It always struck me as a show made for the stoner crowd, but also had some appeal to the masses. I felt enjoyment of it was night and day when comparing watching it straight or not. 'Alf' seemed the same way to me.
Seems a lot of Muppet/Henson productions have that feel. Look at Fraggle Rock: It should have been called Ganja Rock. The Muppet Movie had Kermit on a bike. What stoner isn't left wondering: "He's a frog man. How's he riding that thing? Why's he dating a pig?"
And THAT pig of all. .. .Lets see, we date outside our species to a vain, abusive, overweight person. I wonder what kind of dysfunctional relationships the Muppets are responsible for. .