I didn't have the opportunity to watch the original series when it first aired. I did watch Doctor Who with my children when it was screened on free to air TV. I found it to be both entertaining and sometimes thought provoking.
Later, when I was teaching the Computing Studies syllabus to junior high school girls, the Intelligent Systems lobe required an examination of the way robots were depicted in literature and films versus the nature and function of actual robots. It also required me to introduce the girls to the I Robot short stories of Issac Asimov. Together we watched the Dr Who episodes "Robots of Death" and went to the movies to see The Lawnmower Man.
At the same time, the Original Series of Star Trek was rescreened on Australian TV. For professional reasons I watched the episodes, some of which were quite hilarious. The special effects were very unsophisticated, especially the episode where a man scrabbling around under a piece of carpet was supposed to be a dangerous being that inhabited a mine ???
However, I became hooked on Star Trek and have followed every incarnation of the story, including later series and all of the movies. From a hokey beginning, Roddenberry's creation developed into something rather special with plot lines that can appeal to every age group.