This was one of those seminal moments in television history, because the 70s seemed to be more open to experimentation and strangeness than certainly the 80s and definitely the 90s.
Mary Hartman, Mary Hartman was a show that was unclassifiable by any standard of TV today. Now, I haven't seen the show in about 15 years (I watched the whole series on tape at a friend of mine's back in the mid or late 80s), but I am sure that it would be just as bizarre and wonderful today as ever.
Martin Mull was brilliant as the psychopathic wife beater, Barth Gimble. I hope that TV Land or some other such channel will pick this show up, because I would really love to see it again.