I just wanted to get this group started by talking about some of the shows I personally like and giving you some idea of the range I personally think the group should have. I would like to see this be as inclusive of a group as it can be without totally losing its focus.
I don't see myself as watching a lot of television, but when I list them all I'm amazed at how many science fiction or related shows I've watched over the years. Here are a few shows and a brief opinion of them. Don't feel unwelcome if you don't agree with me on these. Science fiction people tend to be both individualistic and generally tolerant.
Star Trek (original) - I didn't see this first time around, but I have seen it reruns. At its best this was very good in spite of cheap sets and graphics that look dated. On the other hand there were a good number of really poor episodes
Star Trek Next Gen - We watched this religiously as a family. Again the episodes were uneven in quality, with a few genuinely bad ones, a few absolutely great ones, and a goodly number where they set up a situation and then teched their way out of it.
Babylon 5: I tried unsuccessfully to get into this a number of times before I finally decided I liked it. At first the stiff acting put me off and I found it difficult to understand what was going on. Finally one of my friends sat down and gave me enough background to understand what was going on. Once he did that, Babylon 5 became one of my favorite shows. Babylon 5 is difficult to get into because it has a four season story arc. It was originally supposed to be a five season story arc, but it appeared that the show would be cancelled after 4 seasons so the stories of season 4 and 5 were compressed into season 4. The show was then renewed, and the producers had to come up with a season 5. They did their best, but season 5 was obviously an afterthought. Babylon 5 has some of the most intricate space battle scenes I've seen on television, though Battlestar Galactica may do better because the amount of computer power available is much higher now than when Babylon 5 was around.
Dr. Who: I watched many of the original episodes and generally enjoyed them, with Tom Baker as my favorite doctor and either Leela or Ace as my favorite companion. I enjoy the new series as well.
Firefly: I never got to see this on television, but I bought the DVD and I'm glad I did. There is an absolutely classic scene in one of the episodes where you see the captain sitting on a rock in the middle of a totally barren desert looking off in the distance, apparently stark naked (side view thank god). He nods and says, "Yep, that went well." You then flash back to 14 hours earlier. It is a great episode. If you haven't watched Firefly, it's worth the effort.
Battlestar Galactica: Excellent first season. A mixture of good and mediocre since then.
I'm also a Buffy/Angel fan. I didn't start watching Buffy until the sixth season because of the silly name, but once I watched a few episodes I was hooked. I loved Tru Calling for the one season and six episodes it was on. I'm starting to get into Heroes, though that one snuck in under my radar until lately. I've watched quite a few Stargate episodes, though I don't set time aside for them. I haven't been able to get into Lost yet, but Lost fans are certainly welcome here.
In any case, that's what I'm interested in. I would love to hear about your favorite shows, episode, obscure stuff you've found and love, and anything else you want to say about science fiction television.