Oops! I meant 3) Bonanza.
And while we are at it, I really loved The Mentalist and never missed an episode. I still miss Tim Kang as Kimball Cho. One of the most underrated performances on tv. I also very much miss Everybody Loves Raymond.
I'm agreeing with many of the other posts as to which series were most memorable. The Sopranos is also high on my list, as is Carol Burnett and Johnny Carson.
I think that recently, when we changed over to the multi-media era with hundreds of channels and cable vs network and digital devices vs family tv set, we have also diluted the impact of the television medium. It is exponentially much harder to produce a show that many or most people have tuned into the night before and are eager to discuss the next day.
We used to call his character Cho Friday. Greatest deadpan cop since Jack Webb's Joe Friday.