It's tough to pick one overall, as they have changed with me, over the years. The first TV series I remember loving as a kid were.. Planet Of The Apes and The Bionic Woman (the latter mainly because I was in love with Lindsay Wagner). I remember really liking Cheers whenever that was shown. I really loved the short-lived Earth 2 series some years back. More recently, I am a big fan of.. South Park, Lost (series 1 and 2, then it nose-dived and became infuriating), and I currently watch and enjoy The Walking Dead (although the curent series has been pretty lame) and The Good Wife. I loved Breaking Bad once it got going after the dull first series and I have 3 series of Game Of Thrones waiting to be broken into. I'm sure there are stacks of others I've forgot!
Star Trek The Outer Limits Gilligan's Island Bewitched Monty Python's Flying Circus Batman
Space:1999 Fawlty Towers The Mary Tyler Moore Show The Bob Newhart Show Battlestar Galactica The Incredible Hulk The Six Million Dollar Man The Bionic Woman Circle of Fear (short lived horror anthology) Kolchak - The Night Stalker MASH The Partridge Family
Cheers Hill Street Blues Dynasty
I watched long running game shows The Price Is Right and Jeopardy for many years also.
My alltime favourite tv show is TWIN PEAKS. Nothing else comes close. But then there's a whole bunch of great shows after that, especially in the 2000s. Check out my thread on 'paranormal tv shows' for a list of some of them. Also includes a selection of some non-paranormal favourites in the last ten years.
I haven't seen it in a very long time, but I was oddly fascinated by Twin Peaks as a kid. It was unlike anything I'd ever seen before. I was only 11 when it premiered (I often joked later on with my mom and dad about questionable parenting in letting me watch it at that age), so I'd be curious to revisit it nowadays when I could probably understand the nuances and such better.
And I must say, no other character on television has ever creeped me out more than Killer Bob.