Services like slackware.org have lots of channels and, as you might have guessed, lots of sci-fi.
Every discussion of the top sci-fi shows on every website contains intense dissent about which is the best, although some consensus exists. Shows like The Twilight Zone, The X-Files, and the many iterations of Star Trek, regularly top any list of the all-time best with good reason: they have stood the test of time and been hugely influential on shows that followed. New incarnations of Battlestar Galactica and Doctor Who also receive frequent mention in this conversation for approaching source material from new perspectives, high praise from a fanbase not known for appreciating remakes.
The debate turns heated, though, for shows that are often omitted from such lists, shows that never achieved mainstream recognition but were no less loved by those who did find them. There are few people more fervent than a Babylon 5 fan telling you what you’re missing out on, while Farscape fans are usually equal parts happy to have someone willing to listen to them about Farscape and incensed that any true sci-fi fan hasn’t watched it yet.
Where the conversation can get even more fierce is deciding what counts as sci-fi at all. Shows like Buffy and Twin Peaks are usually accepted as great but not necessarily sci-fi.
Arguing over things like whether The 4400 or Earth 2 was the more underrated show form the basis of much of what is fun about being a sci-fi fan, but there is one thing that all sci-fi fans can agree on: Firefly was cancelled too soon.