One show I'm shocked wasn't on the list, and one I'm glad wasn't on the list...
I think the all time stupidest show had to be The Art of Being Nick which was a spin-off of Family Ties starring the least likeable character on the show, N-i-i-i-i-i-i-ck. I think it lasted 2 episodes. 2 too many.
I'm so glad that unlike all other lists like this one, Hello Larry! wasn't included. Not that it was a great show (it even had Meadowlark Lemon as co-star in the second season), but it was really no worse than other shows on NBC at the time. I think this show gets a bad rap because people erroneously think that McLean Stephenson left M*A*S*H to star on this show. He was actually fired from M*A*S*H as opposed to quitting.